Exercices de Anglais : Compétences B2 → C1

Complete the following sentences using the most appropriate modal verb of deduction in the past: 'must have', 'might have', or 'can't have'. 1) Sarah was absent yesterday. She __________ (miss) her bus. 2) The ground is wet. It __________ (rain) during the night. 3) You say you saw John at the party, but he was in London. You __________ (see) him.

Rewrite the following sentences by using the appropriate modal auxiliaries of deduction or hypothesis in the past. Ensure the meaning remains identical. 1. It is almost certain that he forgot his keys because the door is locked from the inside. (Use 'must') 2. There is a strong possibility that she missed the train, as she is not here yet. (Use 'might') 3. It is impossible that they finished the project in just $2$ hours. (Use 'cannot')

Rewrite the following scenarios using the correct modal verb structures to convey the intended nuance of certainty, deduction, or criticism regarding the past.

1. It is logically certain that the suspects escaped through the back window because there are footprints in the mud. (The suspects ______)
2. It was clearly a poor decision for the firm to ignore the market warning last year, which led to their bankruptcy. (The firm ______)
3. Given the lack of concrete evidence, it is possible, though not certain, that the system crash was caused by a malicious virus. (The system crash ______)
4. Analyze the logical deduction based on the evidence rate $R$. If the evidence threshold for a positive conclusion is $R > 0.85$, and we have observed $R = \frac{18}{20}$, apply the correct modal structure to express the degree of certainty regarding the system failure.