used to... 过去总是……
1. They used to get together with some friends once a week when they live here.
2. He used to burn the midnight oil before exam.
3. We used to listen to the radio every evening when we were little.
A: Harry was angry last night.
B: That's because he's getting nervous. Anyway, this is the first time he's directed a play.
A: But he used to be very relaxed and cheerful. It's not like Harry to do a thing like that.
B: Yes, you're right. Maybe there's any other reason.