We use could to talk about a general ability somebody had in the past. We use was/were able to to talk about an ability somebody had at a specific time or event in the past. Choose could, couldn’t, was able to or were able to to complete each...
Mustn’t when something should not be done. Needn’t when you have a choice.
Choose mustn’t or needn’t to complete each sentence.
Mustn’t when something should not be done. Needn’t when you have a choice.
Choose mustn’t or needn’t to complete each sentence.
Use have to when it is necessary to do something, but it is not your choice to do it.
Choose must or have to to complete each sentence.
Use have to when it is necessary to do something, but it is not your choice to do it.
Choose have to, has to or must to complete each sentence.
For something we often did in the past we say used to. But if we ask a question or put did or didn’t in the sentence then we say use to.
Complete each sentence using used to, use to or didn’t use to.
