Ex. 61 Past Simple / Past Perfect 1. Arthur (not to know) that we already (to arrive).
2. George (to finish) doing his homework at eight o'clock.
3. He (to be sure) that we (not to recognize) him.
4. He (to take) the decision before 1 (to come).
5. I (to know) that he (not to learn) the poem.
6. I (to think) that my parents already (to return).
7. Meg (to say) that she (to be) to this city.
8. My friend (to study) English before he (to enter) the
institute.
9. The car (to go) when I (to look) into the street.
10. The doctor (to arrive) when we already (to help) him.
11. The train (to leave) when he (to come) to the station.
12. We (to eat) everything by the time he (to arrive) at the
party.​

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