3
votes
2answers
264 views

Perfect tenses in conditionals

Why does one sometimes use the perfect tense in conditions of the first type? Say, I will do something if you have done something. I did something when he had done something. instead of, ...
3
votes
1answer
64k views

“have been” versus “had been” in questions [duplicate]

Possible Duplicate: How do the tenses in English correspond temporally to one another? "I can tell that he's not English, but I wouldn't had been able to tell that he's french if you didn't ...