The past perfect (continuous) is used to describe an action that happened before another expressed past action. I had been talking with Mary since 4:00 when Jack called at 4:30. She had been living in London with her aunt until the aunt kicked her out.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
guzhao67why the following sentence is ambiguous"ambiguous" means having more than one meaning, of course. I can't imagine more than one meaning for this sentence, so no, I can't explain why it's ambiguous because I don't see the ambiguity!