把下面句子改为祈使句
问题描述：
把下面句子改为祈使句
1.You shouldn't cross the road when the light is red.
2.You must never play football on the street.
3.You should keep quiet in the library.
4.You should listen to the teacher carefully in class.
5.You should be careful when you swim in the river
答
应该是：
1 Don't cross the road when the light is red.
2 Don't play football on the street.
3 Keep quiet in the library.
4 Listen to the teacher carefully in class.
5 Be careful when you swim in the river.