怎么把下列英语句子改成祈使句

问题描述:

怎么把下列英语句子改成祈使句
You can't sit here.
2,You can't walk on the grass.

Don't sit here.
祈使句就是一动词原形开头的句子
表否定的话,直接在句首加相应的否定词