B2 Modals of Deduction & Speculation – Grammar Test 2 | 15 Practice Questions for IELTS, TOEFL & YDS
Strengthen your grammar with B2 Modals of Deduction & Speculation Grammar Test 2. Practice 15 exam-style questions commonly seen in IELTS, TOEFL, and YDS.
Modals of deduction and speculation play a crucial role in expressing degrees of certainty, probability, and logical reasoning in English. At the B2 level, learners must be able to evaluate evidence and choose appropriate modal verbs to describe what is certain, possible, or impossible in both present and past situations. Structures such as must, might, may, could, and can’t allow speakers to express conclusions based on observation, logic, or limited information.
These modal structures are frequently tested in international English proficiency exams including IELTS, TOEFL, and YDS. In these exams, candidates must demonstrate the ability to distinguish between strong certainty and weaker possibility. For example, must expresses a strong logical deduction, while might or could suggest uncertainty. Similarly, can’t is commonly used to indicate that something is logically impossible.
Understanding how to use modals of deduction improves both speaking and writing skills. These forms are widely used in academic discussions, everyday reasoning, and analytical writing. Mastering them enables learners to communicate assumptions, conclusions, and hypotheses with greater accuracy and clarity. This test focuses on advanced B2-level usage of modals of deduction and speculation.
Each question contains three choices. Choose the correct answer.
RESULTS
#1. The lights are still on in his office. He ______ be working late tonight.
#2. She didn’t reply to my email. She ______ seen it yet.
#3. The streets are completely dry. It ______ rained last night.
#4. I’m not sure where they went. They ______ gone to the new café downtown.
#5. He speaks French perfectly. He ______ lived in France for several years.
#6. She looks very happy today. She ______ received good news.
#7. The meeting room is empty. The meeting ______ finished already.
#8. He didn’t answer his phone. He ______ be in a meeting right now.
#9. That explanation doesn’t make sense. It ______ be true.
#10. She left the office very early yesterday. She ______ felt sick.
#11. The students look confused. They ______ understand the instructions.
#12. The door is open and the lights are on. Someone ______ be inside.
#13. They arrived home so quickly. They ______ taken a taxi.
#14. He didn’t attend the lecture. He ______ known about it.
#15. The laptop isn’t in my bag. I ______ left it at the office.
Detailed Explanations
1.
Correct Answer: must
The lights being on suggests strong evidence that the person is still working. When speakers make a confident logical deduction about a present situation, the modal verb expressing strong certainty is used.
2.
Correct Answer: might not have
The speaker assumes that she possibly did not see the email. This modal structure expresses uncertain speculation about a past action.
3.
Correct Answer: can’t have
Because the streets are completely dry, the speaker concludes that rain last night is impossible. English uses this modal structure to express strong negative deduction about the past.
4.
Correct Answer: might have
The speaker does not know where the people went but suggests a possible explanation. A modal expressing possibility about the past is required.
5.
Correct Answer: must have
Speaking French perfectly provides strong evidence that the person spent time in France. This structure expresses logical deduction about a past situation.
6.
Correct Answer: must have
Her happy appearance suggests that she probably received good news earlier. The modal verb expressing strong certainty about a past event is used here.
7.
Correct Answer: must have
The empty meeting room suggests that the meeting ended earlier. This sentence expresses a logical deduction about a past event.
8.
Correct Answer: might
The speaker is not certain why he did not answer his phone. The modal used expresses possibility rather than certainty.
9.
Correct Answer: can’t
The explanation does not make sense, so the speaker concludes that it is impossible. This modal verb expresses strong negative deduction about the present.
10.
Correct Answer: might have
Leaving work early suggests a possible reason, but the speaker is not completely certain. Therefore, a modal expressing speculation about the past is required.
11.
Correct Answer: might not
The students’ confusion suggests that they possibly do not understand the instructions. This structure expresses uncertainty about a present situation.
12.
Correct Answer: must
The open door and lights indicate strong evidence that someone is inside. The modal expressing strong logical deduction about the present is used.
13.
Correct Answer: must have
Arriving home quickly suggests that they likely used fast transportation. The speaker makes a logical deduction about a past action.
14.
Correct Answer: might not have
Because he did not attend the lecture, the speaker suggests the possibility that he was unaware of it. This modal expresses uncertainty about a past event.
15.
Correct Answer: might have
The speaker is not certain where the laptop is but suggests a possible explanation. The modal expresses speculation about a past action.
