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)
