We’d better buy a computer.
You’d better not ask him.
You had best accept his success.
You had best set out early.
A: I heard the temperature is going to drop dramatically tonight.
A: Yes, so you’d better dress warmly before you go out.
B: I will. Thanks for telling me.
A: You’re welcome. I wouldn’t want you to catch a cold.
B: Thanks for your concern. I don’t want to get sick either.