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.