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Degree Of Certainty – Quiz 1
Degree Of Certainty Quiz 1 (21 MCQs)
This multiple-choice question set evaluates the understanding of different levels of certainty in English grammar, including conditional sentences and modal verbs. It covers various contexts such as past events, hypothetical situations, and reporting verbs to assess students' ability to compare degrees of confidence.
Quiz Instructions
Select an option to see the correct answer instantly.
1.
He didn't even smile at my jokes. He ..... they were funny.
A) Should have think.
B) Shouldn't have thought.
C) Must not have thought.
D) Wouldn't have think.
Show Answer
Explanations:
The sentence requires a verb form that indicates the man's negative opinion about the jokes with certainty. "Must not have thought" conveys this certainty effectively, meaning he definitely did not think they were funny.
Option Analysis:
Option A:
Should have think - Incorrect; should expresses obligation, and think is in the wrong form.
Option B:
Shouldn't have thought - Possible but less certain than "must not have thought." It implies a possibility rather than certainty.
Option C:
Must not have thought - Correct; must conveys strong certainty, and not indicates the negative opinion.
Option D:
Wouldn't have think - Incorrect; wouldn't is in the wrong form, and think is missing an 't' to be a contraction.
2.
I ..... more for the exam. I was lazy, and now I'll fail!
A) Couldn't have studied.
B) Should have studied.
C) Could have study.
D) Would have study.
Show Answer
Explanations:
The sentence "I should have studied more for the exam." indicates a past action that was not taken but is now recognized as necessary due to its consequences (failing). This reflects a sense of obligation and regret, which aligns with the concept of degree of certainty in expressing what one believes ought to have happened.
Option Analysis:
Option A:
"Couldn't have studied" suggests an impossibility, which does not fit the context of a past action that was avoidable.
Option B:
"Should have studied" correctly expresses a recommendation for what one believes ought to have been done in the past. This aligns with expressing regret and obligation.
Option C:
"Could have study" is grammatically incorrect, making it an invalid option.
Option D:
"Would have study" implies a hypothetical future action rather than a past one that was missed.
3.
Tim's supposed to be here, but it looks like he .....
A) Couldn't have forget.
B) Shouldn't have forgotten.
C) May have forgotten.
D) Would have forgot.
Show Answer
Explanations:
Option C, "May have forgotten," is correct because it expresses a degree of uncertainty that fits the context of the sentence. The phrase suggests that Tim might have forgotten but does not confirm it, which aligns with the incomplete information provided in the scenario.
Option Analysis:
Option A:
"Couldn't have forget" is incorrect because it implies certainty about an action that did not occur, which contradicts the uncertain tone of the sentence.
Option B:
"Shouldn't have forgotten" suggests a sense of obligation or expectation, which does not match the uncertainty in the original statement.
Option D:
"Would have forgot" is grammatically incorrect and implies certainty about an action that did not happen, making it unsuitable for this context.
4.
Matt ..... college in 1997. He was only 14 years old.
A) Couldn't have graduated.
B) Might not have graduate.
C) May not have graduated.
D) Must not have graduate.
Show Answer
Explanations:
The correct answer is A) Couldn't have graduated. This option expresses the highest degree of certainty that Matt, being only 14 years old in 1997, could not possibly have completed his college education by that age. College typically requires a minimum of 16-18 years of age depending on the country and institution.
Option Analysis:
Option A:
Expresses absolute certainty based on typical educational requirements.
Option B:
Implies uncertainty, which is not appropriate given the context. Might suggests a possibility that does not align with the facts provided.
Option C:
Also implies uncertainty and is less definitive than A. May indicates a possibility rather than impossibility.
Option D:
Uses negative form which is grammatically incorrect in this context, making it an invalid option.
5.
The window was broken, so the thieves ..... got in through that window.
A) Shouldn't have.
B) Must have.
C) Should have.
D) Mustn't have.
Show Answer
Explanations:
The sentence "The window was broken, so the thieves must have got in through that window" implies a high degree of certainty based on the given information. The use of "must have" indicates that it is highly likely or certain that the thieves entered through the broken window.
Option Analysis:
Option A:
Shouldn't have - This suggests an action that should not have occurred, which does not fit the context of certainty.
Option B:
Must have - This correctly conveys a high degree of certainty based on the broken window being the only available entry point.
Option C:
Should have - This implies a recommendation or obligation, which is not appropriate in this context.
Option D:
Mustn't have - This suggests an action that definitely did not occur, which contradicts the given information about the broken window.
6.
Which is stronger
A) Their findings will probably cause a stir in scientific circles.
B) Their findings will certainly cause a stir in scientific circles.
C) All the above.
D) None of the above.
Show Answer
Explanations:
Option B is correct because it uses the word "certainly," which indicates a higher degree of certainty compared to "probably" in Option A. In scientific contexts, statements are often made with varying degrees of confidence, and "certainly" suggests that the findings will definitely cause a stir.
Option Analysis:
Option A:
Uses "probably," indicating a lower degree of certainty.
Option B:
Uses "certainly," indicating a higher degree of certainty and is thus correct.
Option C:
Suggests both options are equally strong, which is not the case as Option B expresses more certainty.
Option D:
Indicates none of the above, which is incorrect since Option B is valid.
7.
I've phoned Jim several times, but he doesn't answer. He ..... out.
A) Shouldn't have go.
B) Should have went.
C) Couldn't have gone.
D) Must have gone.
Show Answer
Explanations:
The sentence "He must have gone out" indicates a high degree of certainty that Jim has left, based on the context provided (Jim not answering phone calls). This usage of "must have" conveys strong certainty about past events.
Option Analysis:
Option A:
Incorrect. "Shouldn't have go" is grammatically incorrect and does not convey a high degree of certainty.
Option B:
Incorrect. "Should have went" is also grammatically incorrect, as the correct form would be "should have gone."
Option C:
Incorrect. "Couldn't have gone" implies impossibility, which does not fit the context of Jim likely leaving.
Option D:
Correct. "Must have gone" is appropriate for expressing a high degree of certainty about past events based on contextual clues.
8.
Which is weaker?
A) The Government must regulate against cartel membership if insider trading is to be avoided.
B) The Government should consider regulating against cartel membership if insider trading is to be avoided.
C) All the above.
D) None of the above.
Show Answer
Explanations:
Option B uses "should consider," indicating a lower degree of certainty compared to the mandatory language in Option A, which states "must." This suggests that while Option B implies a recommendation, it does not assert as strongly as Option A that regulation is necessary.
Option Analysis:
Option A:
Uses "must," indicating a higher degree of certainty and necessity.
Option B:
Uses "should consider," suggesting a lower degree of certainty, implying a recommendation rather than an absolute requirement.
Option C:
Includes both A and B, making it weaker since it acknowledges the lesser certainty in Option B.
Option D:
Denies any of the above as correct, which is not supported by the analysis.
9.
The investigators have several ideas about what ..... caused the fire.
A) Should have.
B) Might have.
C) Wouldn't have.
D) Would have.
Show Answer
Explanations:
The correct answer is
B) Might have.
This option indicates a degree of uncertainty, which aligns with the context of investigators speculating about possible causes for an event (the fire). The phrase "might have" suggests that while there are several ideas, none can be confirmed as certain.
Option Analysis:
Option A:
Should have - Implies a sense of obligation or necessity, which is not relevant to the speculative nature of the investigators' thoughts.
Option B:
Might have - Indicates possibility without certainty, fitting the context perfectly.
Option C:
Wouldn't have - Suggests impossibility or negation, which does not match the exploratory tone of the sentence.
Option D:
Would have - Implies a definite outcome, contradicting the speculative nature of the investigators' ideas.
10.
I can't believe Jim hasn't arrived yet. He ..... the correct train.
A) Should have took.
B) Could have take.
C) Must have took.
D) Couldn't have taken.
Show Answer
Explanations:
The sentence "I can't believe Jim hasn't arrived yet. He couldn’t have taken the correct train." expresses a high degree of certainty that Jim did not take the right train, given his absence.
- **Option A: Should have took** - This implies a suggestion or obligation, which doesn't fit the context.
- **Option B: Could have take** - The verb form is incorrect and doesn’t convey the necessary certainty.
- **Option C: Must have took** - While it suggests Jim definitely did not take the train, it sounds awkward due to the past perfect tense with "must."
- **Option D: Couldn't have taken** - This correctly conveys a high degree of certainty that Jim did not take the correct train.
Option Analysis:
Option A:
Incorrect verb form and implies obligation.
Option B:
Grammatically incorrect.
Option C:
Sounds awkward but conveys certainty.
Option D:
Correctly expresses high degree of certainty.
11.
I can't believe you met Steve Jobs in person. That ..... amazing!
A) Must have been.
B) Might have feel.
C) Should have be.
D) Couldn't have seen.
Show Answer
Explanations:
The sentence "I can't believe you met Steve Jobs in person. That ... amazing!" expresses a high degree of certainty that the meeting actually happened, given the context and the speaker's disbelief. The phrase "must have been" conveys this strong certainty appropriately.
Option Analysis:
Option A:
Correct. "Must have been" indicates a high level of certainty about the past event.
Option B:
Incorrect. "Might have felt" suggests uncertainty or possibility, not strong certainty.
Option C:
Incorrect. "Should have be" is grammatically incorrect and does not convey the intended meaning.
Option D:
Incorrect. "Couldn't have seen" implies impossibility, which contradicts the context of disbelief but not denial.
12.
We really enjoyed the movie. You ..... with us.
A) Should have come.
B) Can't have come.
C) Might have came.
D) Must have came.
Show Answer
Explanations:
The sentence "We really enjoyed the movie. You should have come with us." expresses a suggestion or advice based on past events, indicating that the speaker believes the listener would have enhanced their enjoyment of the movie if they had attended. This implies a degree of certainty about what would have happened if the listener had been present.
Option Analysis:
Option A:
Correct. "Should have come" expresses a past recommendation or advice, indicating that the speaker believes the listener's absence detracted from their enjoyment.
Option B:
Incorrect. "Can't have come" suggests impossibility, which is not applicable here as there’s no certainty about the listener's actions in the past.
Option C:
Incorrect. "Might have came" uses incorrect verb form and implies a possibility rather than a recommendation or advice based on past events.
Option D:
Incorrect. "Must have came" suggests certainty about what happened, which is not the case here as we are discussing what could have been done differently to improve the experience.
13.
Do you think we ..... the economic crisis if we had taken greater precaution?
A) Could have avoided.
B) Must have avoid.
C) Should have avoiding.
D) Might not have avoid.
Show Answer
Explanations:
The correct answer is
A) Could have avoided.
This option uses the modal verb "could" with "have" (could have), which indicates a past possibility or ability to avoid an event, aligning well with expressing what might have been done differently in the past.
Option Analysis:
Option A:
Correct. Uses "could have avoided," indicating a past possibility.
Option B:
Incorrect. "Must have avoid" uses "must," which implies certainty, not just possibility or ability.
Option C:
Incorrect. "Should have avoiding" is grammatically incorrect and does not fit the context of expressing past possibility.
Option D:
Incorrect. "Might not have avoid" uses "might," which implies a lower degree of certainty than what the question suggests for discussing past actions that could have been taken differently.
14.
John ..... at the party last night. He's not even in the country. He flew to Japan yesterday morning.
A) Couldn't have been.
B) May not have be.
C) Shouldn't have been.
D) Might not have be.
Show Answer
Explanations:
The sentence indicates that John was not present at the party last night, and it is certain because he flew to Japan yesterday morning. This means there is no possibility of him being at the party. Therefore, "Couldn't have been" (Option A) correctly expresses this certainty.
Option Analysis:
Option A:
Correct. Expresses a high degree of certainty that John was not at the party.
Option B:
Incorrect. "May not have been" suggests a possibility, which is not appropriate given the information provided.
Option C:
Incorrect. "Shouldn't have been" implies a recommendation or obligation, not certainty about what did happen.
Option D:
Incorrect. "Might not have been" also suggests possibility rather than certainty.
15.
He studied nothing and passed the exam, so he ..... cheated.
A) Shouldn't have.
B) Must have.
C) Can't have.
D) Should have.
Show Answer
Explanations:
The sentence "He studied nothing and passed the exam, so he must have cheated." implies a high degree of certainty that the student cheated because there is no other plausible explanation for passing without studying. The phrase "must have" indicates a strong inference based on the given information.
Option Analysis:
Option A:
Shouldn't have - This suggests an obligation or expectation, not a certainty derived from the context.
Option B:
Must have - Correct. It conveys a strong inference based on the given information that cheating is the most likely explanation for passing without studying.
Option C:
Can't have - This would imply impossibility, which contradicts the possibility of passing by other means not mentioned in the context.
Option D:
Should have - Implies a recommendation or expectation, not a certainty derived from the context.
16.
I'm not completely convinced of his innocence. I think he ..... been involved.
A) Must have.
B) Might have.
C) Must not have.
D) Should have.
Show Answer
Explanations:
The phrase "I'm not completely convinced of his innocence" indicates a level of uncertainty, but does not rule out the possibility that he could be innocent. Therefore, using "Might have" conveys this uncertainty appropriately without asserting certainty or impossibility.
Option Analysis:
Option A:
Must have - This implies certainty, which contradicts the statement of uncertainty.
Option B:
Might have - This accurately reflects the level of uncertainty expressed in the original sentence.
Option C:
Must not have - This implies certainty about his innocence, which is not supported by the statement.
Option D:
Should have - This suggests a recommendation rather than stating a fact or possibility based on the given information.
17.
I'm not a fan of their logo. I think they ..... it years ago.
A) Could have written.
B) Should have changed.
C) Would have spoken.
D) Must have known.
Show Answer
Explanations:
The phrase "should have" indicates a suggestion of what was advisable to do in the past, implying that changing the logo would have been beneficial but is not necessarily stating it as an absolute fact. This aligns with expressing a degree of certainty about a recommendation.
Option Analysis:
Option A:
Could have written - Implies possibility rather than necessity or advisability.
Option B:
Should have changed - Suggests what was advisable to do in the past, indicating a degree of certainty about a recommendation.
Option C:
Would have spoken - Implies a hypothetical action without context for its necessity or advisability.
Option D:
Must have known - Implies certainty about knowledge, not advisability or past actions.
18.
You ..... it in front of the rest of the people. I would have talked to him in private about it.
A) Would have mentioned.
B) Should have mention.
C) Shouldn't have mentioned.
D) Could have mention.
Show Answer
Explanations:
The sentence uses the past conditional tense, indicating a hypothetical situation that did not occur. The correct answer is C) Shouldn't have mentioned because it expresses a negative suggestion about what should not have been done in the past based on the speaker's opinion.
Option Analysis:
Option A:
Incorrect as "Would have mentioned" implies a positive action that could have happened, which doesn't align with the negative implication of the sentence.
Option B:
Incorrect as "Should have mention" is grammatically incorrect and does not fit the conditional tense used in the context.
Option C:
Correct as it conveys the speaker's belief that mentioning it publicly was a mistake, fitting the past conditional tense.
Option D:
Incorrect as "Could have mention" is grammatically incorrect and does not fit the conditional tense used in the context.
19.
Nobody knows exactly why he died. But we think it ..... been an accident.
A) Can.
B) Should have.
C) Might have.
D) Can have.
Show Answer
Explanations:
The correct answer is
C) Might have.
This option expresses a degree of uncertainty, which fits the context where nobody knows exactly why he died but suggests it could be an accident. "Might have" indicates a possibility without strong certainty.
Option Analysis:
Option A:
Can - Implies ability rather than past occurrence or possibility.
Option B:
Should have - Implies obligation or expectation, not uncertainty.
Option C:
Might have - Indicates a possible but uncertain event in the past.
Option D:
Can have - Similar to "can," implies ability rather than occurrence.
20.
Sarah looked very happy. She ..... passed her driving test.
A) Must have.
B) Could have.
C) May have.
D) Can.
Show Answer
Explanations:
The sentence "Sarah looked very happy. She must have passed her driving test." indicates a high degree of certainty that Sarah passed the driving test based on her appearance. The phrase "must have" expresses strong certainty, which aligns with the context provided by Sarah's happiness.
Option Analysis:
Option A:
Correct. Indicates strong certainty.
Option B:
Less certain than must have. Implies possibility but not high confidence.
Option C:
Also less certain, suggesting a possibility rather than a strong inference.
Option D:
Incorrect. Does not convey certainty or uncertainty; it is an ability statement.
21.
They said they were going to pick us up at 7 p.m. I think they ..... somewhere else!
A) Would have went.
B) May have.
C) Should have go.
D) Must not have gone.
Show Answer
Explanations:
The sentence "They said they were going to pick us up at 7 p.m. I think they may have." indicates a degree of uncertainty about whether the speakers' assumptions are correct, but it does not imply a strong certainty or necessity. The phrase "may have" suggests that there is a possibility that something happened in the past (they went somewhere else), but it's not certain.
Option Analysis:
Option A:
"Would have went" - Incorrect tense and form.
Option B:
"May have" - Correct, indicates uncertainty about a past event.
Option C:
"Should have go" - Incorrect verb form and tense.
Option D:
"Must not have gone" - Implies certainty that they did not go somewhere else, which contradicts the sentence's tone of uncertainty.
Frequently Asked Questions
What is the degree of certainty in English grammar?
Degree of certainty in English grammar refers to how sure we are about a statement, whether it's about past events, hypothetical situations, or recommendations. It’s often expressed using adverbs like 'certainly,' 'probably,' and 'possibly.'
How does degree of certainty apply to reporting verbs?
Degree of certainty in reporting verbs is used when recounting events or situations. It helps convey the level of confidence about the accuracy of the information, such as using 'reported' for less certain statements and 'stated' for more certain ones.
Can you explain how degree of certainty is used in past events?
In discussing past events, the degree of certainty can be indicated by adverbs like 'definitely,' 'probably,' or 'possibly.' These help to clarify whether the information about a past event is based on firsthand knowledge or inference.
What role do adverbs play in expressing degree of certainty?
Adverbs such as 'certainly,' 'probably,' and 'possibly' are crucial for expressing the degree of certainty in a statement. They modify verbs, nouns, or other adverbs to indicate the level of confidence or likelihood.
Why is understanding degree of certainty important in English grammar?
Understanding degree of certainty is important because it enhances clarity and precision in communication. It allows speakers and writers to convey the exact level of confidence they have about their statements, making their intentions clearer to the audience.