Complete the sentences with the verbs from the box.
(can, can't, may, may not, must, mustn't)
1) It's very hot. You … water the flowers.
2) Nick … play chess very well.
3) … i go for a walk? - No, you … . Where is your homework?
4) You … swim here. The water isn't clean.
5) Sorry, i ... help you now.
6) It's raining. I ... take my umbrella.