英语中如何将陈述句改为祈使句

问题描述:

英语中如何将陈述句改为祈使句

肯定句,将主语去掉,例如:You must clean it.改为Clean it.
否定句,将主语去掉,句首加上Don't.例如:You shouldn't do this.改为Don't do this.