Studentsd must 和Students must not怎样造句?

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Students must help their parents do some housework and do their homework on time
学生应该帮助父母亲做些家务活并且应该要按时完成作业
Studnes must not throw the paper on the road
学生不应该在马路上丢纸屑
======以下答案可供参考======
供参考答案1:
must 加否定似乎是禁止的意思吧~~
供参考答案2:
Student must study hard.
Student must not smoking.
供参考答案3:
Studentsd must ：
1 Students must by have the English class carefully
2 Students must actively raised one′shand
3 Students must listen to the teacher′s worlds
4 Student must study hard.
5 Students must help their parents do some housework and do their homework on time
Students must not：
1 Students must not be late for class
2 Students must not jump the queer
3 Students must not speak in class
4 Students must not eat in class
5 Students must not fight at schooi