Model: I know how to skate. (can/may) - I can skate. 1. It's not good for people to watch TV all the time. (mustn't/shouldn't)

2. It is not necessary for you to wait. (mustn't/needn't)

3. I want to take your photo. (may/must?)

4. It's useful for you to walk in the park. (can/should)

5. Do you want me to open the window? (shall/will)