Раскройте скобки, заменив инфинитив соответствующей формой глагола в present perfect или 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 o’clock yesterday.

1. This young man (had worked) at the factory before he entered the university.
2. The football match (had begun) by the time I could get to the stadium.
3. I am not feeling well, I (have caught) a cold.
4. After the doctor (had examined) the patient he wrote out a prescription.
5. Her son (has not returned) from school yet.
6. Peter is absent today, he (has fallen) ill.
7. The teacher (had explained) the students their homework before the bell rang.
8. I (had translated) this article by the time you came.
9. Jack has just (gone) to the station to meet his elder brother.
10. The scientist (had finished) this experiment by 5 o’clock yesterday.