You should have phoned Petrov again. | | |
Your friend should have seen a doctor long ago. | | |
He may have tried to prove to her that he was right but failed. | | |
The delegation may arrive any minute. | | |
You must prepare all the necessary documents very quickly. | | |
Your son must have been studying for 5 hours without a break. | | |
You should make him go out for a walk. | | |