祈使句表示请求,命令,叮嘱,号召等.
谓语动词用原型,肯定的祈使句一般不把主语表示出来,如果要特别强调的话也可以加上.
如果感情很强烈,就加上Do
^^
Come in!
Be careful.
Please read the text.
You be quiet!
Come in,everyone!
Do come on time!
Do sit down!