1.He … (can’t/couldn’t) open the window as it was stuck. 2.Interpreters … (may/must) translate without dictionaries.

3… (Can/May) I use me your bike for today?

4… (May/Could) you give me the recipe for this cake?

5.Take an umbrella. It … (may/can) rain.

6.You … (could/should) stop smoking. You know you … (cannot/must not) buy health.