1) When Susan was five, she could read and write. 2) I must get up early today. Because I have a test. 3) Birds can fly but lions can't. 4) This bag is too heavy for you, may I help you? 5) I must wear school uniform at my school. 6) You can't smoke here. It is forbidden. 7) Could you turn on the lights, please? 8) I must help my mother with the housework. She is tired. 9) You can't be late for school. 10) You should do your homework if you want to go.
