Раскройте скобки, употребляя глаголы в Present Perfect, Past Perfect, Future Perfect:
1. Will you go to the library tomorrow? - No, I already (to be) to the library this week.
2. I (to lose) my key when I was playing in the yard yesterday.
3. He (to finish) his homework by 7 o'clock.
4. You ever (to be) to the Hermitage.
5. Mary (to finish) the composition by the time he came.
6. I (to live) in St. Petersburg since 1990.
7. My father (not to come) home at dinner tomorrow.
8. You (to buy) already necessary books?