A: I found a briefcase on the train.
B: You ought to/can take it to the police station as soon as possible.

A: Did you get some money from the bank?
B: No, I didn't need to/needn't. I had enough in my wallet.

A: Sorry I'm late again.
B: You should/mightwear a watch.

A: Couldn't/MayI speak to Claire, please?
B: Just a moment, please. I'll call her.

A: We could/mustgo out for a meal this evening, if you like.
B: Oh, yes. That would be nice.

A: I wonder if Paul and Jim have got lost.
B: They can't/mustn'thave got lost because I gave them a map.

A: Could/WouldI use your telephone, please?
B: Yes, of course.

A: Was the exam very difficult?
B: Yes, but I can/was able toanswer all the questions.

A: We mustn't/needn'tgo shopping this week. We've got plenty of food.
B: Alright. We'll go next week instead.

A: Should/MayI sit down, please?
B: Yes, of course. Make yourself at home.

A: When will/shallI visit you next?
B: You can/mustcall in tomorrow, if you like.

A: Helen should be here by now.
B: She ought to/couldhave missed the train.