Question

поставьте время, просто я не понимаю ничего -.-
I (talk) on the phone when he came.
They (sit) in the hall when they brought her letter.
He forgot everything he (learn) at the uneversity.
I visited London last year I (stay)at a nice hotel for five.

Answer 1

1. was talking
2. were sitting 
3. had learnt
4. wa staying