I may go. Both indicate events that have yet to take place. Today, we are discussing the modal verbs that, however, express past actions. Even when such seem to be referring to the future ...

NASA says it may/might/could have been suitable for life in the past. We use the modal verbs must and can’t in the present and the past when we believe strongly that something is certain.

expressions with avoir and être and modal verbs. The perfect tense with avoir and être The perfect tense is used to talk about something that happened in the past, such as an action that is ...