A2. Probability: We use the modal 'must' to show we are sure something to be true and we have reasons for our belief. (e.g. It’s getting dark. It must be quite late. You haven’t eaten all day. You must be hungry.)
a. We use 'must have' for the past. (e.g. They hadn’t eaten all day. They must have been hungry. You look happy. You must have heard the good news.)
b. use the modal 'should' to suggest that something is true or will be true in the future, and to show you have reasons for your suggestion. (e.g. Ask Miranda. She should know. It's nearly six o'clock. They should arrive soon.)
c. use 'should have' to talk about the past. (e.g. It's nearly eleven o'clock. They should have arrived by now.)
Idiom 365
Give Him The Slip: to escape or to get away from someone
Example: They will be very busy tonight, let's give them the slip and go out to a dinner.