Раскройте скобки, заменив инфинитив подходящей формой глагола в Present Perfect либо

Раскройте скобки, заменив инфинитив подходящей формой глагола в Present Perfect либо Past Perfect. 1. This young man (to work) at the factory before he entered the university. 2. The football match (to begin) by the time I could get to the stadium. 3. I am not feeling well, I (to catch) a cold. 4. After the doctor (to examine) the patient he wrote out a prescription. 5. Her son (not to return) from school yet. 6. Peter is absent today, he (to fall) ill. 7. The teacher (to explain) the students their homework before the bell rang. 8. I (to translate) this article by the time you came. 9. Jack just (to go) to the station to meet his elder brother. 10. The scientist (to finish) this experiment by 5 oclock yesterday.