16.1 1) They've just arrived.
2) He's just woken up.
3) They've just bought the car.
4) The race has just started.
16.2 1) He's already arrived.
2) No, they've already seen it.
3) I've already phoned him.
4) He's already gone away.
5) I've already read it.
6) She's already started it.
16.3 1) She hasn't gone out yet.
2) The bus has just gone.
3) The bus hasn't gone yet.
4) He hasn't opened it yet.
5) They've just finished their dinner.
6) It hasn't stopped raining yet.
16.4 1) Have you started your new job yet?
2) Have you met your new neighbors yet?
3) Have you written your letter yet?
4) Have you sold your car yet?