1 You don't have to tell him this matter.
2 You had better not to stay up.
3 When watching movies,you must keep quiet.
4 Why don't you share your joy of success with your mother?
5 Perhaps you shou stop to enjoy the blue sky.
6 When I arrived,the movie had been showed for half an hour.
7 When mon came home,dad had left for ten minutes.
8 Before you told me,I had never heard of this place.