
- The lesson has not started yet.
- The teacher has already written on the board.
- Joe and Tim have just come into the classroom.
- Tony has not finished getting his books ready.
- Christine has already opened her book.
- Dave has dropped his pen on the floor.
- He has not picked it up yet.

D.
- have you been doing
- I’ve been studying
- Have you been working
- I’ve just been sitting
- I haven’t been going
- I’ve been working
- I’ve been painting
- we’ve also been planning
- We’ve been looking
- I’ve been thinking
E.
- heard
- arrived
- been writing
- been talking
- invited
- been reading
- been playing
F.
- yet
- for
- ever
- already
- since
- just
- never
