Modaux de déduction au passé (B2-C1)

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')