3. They must have been waiting at
8:30 p.m. =
They were probably waiting at 8:30
p.m.
4. He might have been sleeping at
10:30 p.m. =
Maybe he was sleeping at 10:30
p.m.
5. You could have been doing your
homework this morning = You had
the opportunity to be doing your
homework this morning (but you
didn’t do it.)
6. You should not have been driving so
fast = It was a mistake that you
were driving so fast. (Probably you
had an accident or got a ticket
because of this mistake.)
