Замените инфинитивы глаголами в Present Perfect, Present In-definite, Present Continuous, Present Perfect Continuous:
1. He (to solve) _____________ the cross-word puzzle for half an hour and he (to say) __________ he (to be) ____________ about to finish it as he (to think) ______________ over the last word. 2. The actors (to rehearse) ____________ since early morning; now they (to go over) _______________ the first scene as they (not to be) ____________ satisfied with their acting. 3. Here you (to be) _____________ at last! I (to wait) ______________ for you for twenty minutes. _______ you (not to be) ashamed? 4. She (to speak) ____________ over the tele-phone long enough, it (to be) _______________ time for her to stop talking. 5. Since you (to keep) ______________ late hours this week you (to look) _______________ tired and worn out. 6. It (to snow) _______________ steadily the whole week and it still (to snow) ______________. If it (to go) ____________ on like this nobody will be able to reach the camp. 7. At last you (to open) _______________ the door! I (to ring) _______________ for an hour at least, it (to seem) ________________ to me. 8. My watch (to keep) ________________ good time ever since the first repair. 9. They (to discuss) _________________ this questions ever since I (to be) ______________ here and they (not to come) _______________ to any definite conclusion yet. 10. The typist (to miss) ________________ several words as she (to talk) __________________ all the time. 11. The lecturer (to mention) ________________ this name several times but I cannot remember it. I (to write) ________________ it down as soon as he (to mention) __________________ it again. 12. He (to work) __________________ at the language all the time and (to make) ___________________ great progress. His phonetics (to be) ________________ perfect, only a slight accent (to remain) _____________________.