1、Stand up,please.

2、Sit dawn,please.

3、Come in.

4、Let"s go.

5、Please pass me the book.

6、Please read this book.

7、Look at me.

8、Please don"t open the door.

9、Listen to me,please.

10、Don"t forget me.

11、Go and wash your hands.

12、Please be quiet.

13、Be kind to your sister.

14、Watch your steps.

15、Look out！Danger！

16、Keep off the grass.

17、No smoking.

18、Beg your pardon.

19、Please close the window.

20、Open the door,please.