Past Perfect - Past Perfect ContinuousRevision:
used to - to go out with someone - straight away
Past Perfect - had + past participle
For actions which happen before other actions in the past, i.e.
- When we got to the theatre the play had already started.
- She'd wanted to be an astronomer ever since she was a child.
- After he'd recovered from his injuries he wrote a book about his adventure.
Past Perfect Continuous - had + been + ing
For an action happening over a period of time before another action in the past, i.e.
- He'd been hoping for a place on the team but the manager chose another player.
- They'd been waiting for the flight for three hours when the airline said it was cancelled.
- She'd only been playing chess for a year when she won the local club tournament.
I bet - (Informal) I am sure of something, i.e.
- I bet it'll rain tomorrow.
- I bet he passes all his exams.
- I bet she won't come to the party.