нужно решить,

Раскройте скобки, употребляя глагол в форме Present, Past или Future Perfect.
1. Popov just (to finish) work.
2. When they come the lesson already (to begin).
3. I know this man well. – Since when you (to know) him?
4. He thanked me for what I (to do) for him.
5. I hope it (to stop) raining by 5 o’clock.
6. He entered the University after he (to work) in industry.
7. The delegation (to arrive) by next Friday.
8. I (not to see) this film yet.
9. He never (to play) chess so well before.
10. I cannot give you a definite answer as I (not to discuss) this problem with the director.