B2 Modals of Deduction & Speculation – Grammar Test 1 | 15 Practice Questions for IELTS, TOEFL & YDS
Practice B2 Modals of Deduction and Speculation with this 15-question grammar test. Improve your English for IELTS, TOEFL, and YDS with realistic exam-style questions.
Modals of deduction and speculation are an essential part of upper-intermediate English grammar. These modal verbs allow speakers and writers to express logical conclusions, possibilities, and assumptions about present or past situations. At the B2 level, learners are expected to confidently use structures such as must, might, may, could, and can’t when making deductions based on evidence or reasoning.
In international English exams such as IELTS, TOEFL, and YDS, modal verbs frequently appear in grammar questions, reading passages, and listening tasks. Test takers must be able to interpret subtle differences between certainty, probability, and impossibility. For example, must expresses strong certainty, while might and may indicate possibility. On the other hand, can’t is commonly used to express strong disbelief or logical impossibility.
Understanding modals of deduction helps learners communicate ideas more precisely and naturally. These structures are commonly used in academic discussions, everyday conversations, and analytical writing. In this test, you will practice identifying the correct modal verb based on the context and logical meaning of each sentence.
Each question has three choices. Select the correct answer.
RESULTS
#1. The lights are off and the door is locked. They ______ gone home already.
#2. She looks very tired today. She ______ slept well last night.
#3. I’m not sure where John is. He ______ be in the library.
#4. The ground is wet. It ______ rained during the night.
#5. They didn’t answer the phone. They ______ be busy right now.
#6. She passed the exam with the highest score. She ______ studied very hard.
#7. That restaurant is always empty. It ______ be very good.
#8. He isn’t answering his messages. He ______ be driving.
#9. They arrived very early this morning. They ______ left home at dawn.
#10. She didn’t attend the meeting yesterday. She ______ forgotten about it.
#11. The office lights are still on. Someone ______ be working late.
#12. He didn’t recognize me at the party. He ______ remembered my name.
#13. The road is completely empty. Everyone ______ left already.
#14. She looks confused. She ______ understand the instructions.
#15. The package isn’t here yet. It ______ arrive later today.
Detailed Explanations
1.
Correct Answer: must have
The sentence provides strong evidence that the people are no longer present because the lights are off and the door is locked. When speakers make a strong logical deduction about a past action, the structure “must have + past participle” is used.
2.
Correct Answer: can’t have
The speaker believes it is impossible that she slept well because she looks extremely tired. The modal structure used to express strong negative deduction about the past is “can’t have + past participle.”
3.
Correct Answer: might
The speaker is uncertain about John’s location and only suggests a possible explanation. In English, modal verbs expressing possibility rather than certainty are used for speculation.
4.
Correct Answer: must have
The wet ground provides strong evidence that rain occurred earlier. In such cases, English uses a modal verb expressing strong logical deduction about the past.
5.
Correct Answer: might
The speaker does not know the exact reason why they did not answer the phone. Therefore, a modal expressing possibility rather than certainty is required.
6.
Correct Answer: must have
Achieving the highest score strongly suggests that the student studied seriously. When evidence leads to a confident conclusion about a past action, this modal structure is used.
7.
Correct Answer: can’t
The restaurant is always empty, which leads the speaker to conclude that it is probably not good. English commonly uses a modal verb expressing impossibility or strong negative deduction.
8.
Correct Answer: might
The speaker is making a possible explanation for why he is not replying to messages. This modal expresses speculation without strong certainty.
9.
Correct Answer: must have
Arriving very early implies that they left home very early. This is a logical conclusion about a past action based on available evidence.
10.
Correct Answer: might have
The speaker is not completely sure why she missed the meeting. A modal expressing uncertain speculation about a past event is required.
11.
Correct Answer: must
The lights being on suggests that someone is probably still working in the office. This modal expresses strong logical deduction about a present situation.
12.
Correct Answer: can’t have
Because he failed to recognize the speaker, it is logically impossible that he remembered the name. English uses this modal structure to express negative deduction about the past.
13.
Correct Answer: must have
The empty road suggests that everyone has already gone. The speaker uses a modal expressing strong certainty about a past action.
14.
Correct Answer: might not
Her confused expression suggests that she possibly does not understand the instructions. This modal structure expresses uncertainty or probability rather than certainty.
15.
Correct Answer: might
The speaker is not sure when the package will arrive but suggests a possible future outcome. This modal expresses speculation rather than certainty.
