The present perfect continuous has two parts - the main verb and the auxiliary verbs. He has been thinking about it for ages. She's been driving since 4 o'clock. In these examples, the main verbs are ...

The present perfect is often used to talk about situations that started in the past and are continuing now. We sometimes use the present perfect in a question with how long to ask about how long a ...

The present perfect is often used to say whether an action has happened or not at the present time. The action might be necessary or expected by someone, and we want to say if it is complete or not.