1.past indefinite tense, present perfect, past continuous or present perfect continuous? little mary came in. she … (eat) an ice-cream. i dropped my bag when i … (run) for a bus. i … (know) him for years. she … (work) here for five years. i … (return) home yesterday.

Привет! Я думаю так:
1) Little Mary came in. She was eating an ice-cream.
2) I dropped my bag when I ran for a bus.
3) I have known him for years.
4) She has been working here for five years.
5) I returned home yesterday.