keep sth done的用法归纳分点回答

keep sth done（done必须是过去分词）是固定搭配。

终结性动词的动作结束会导致转态的改变。而过去分词既表示被动，也表示动作的完成。终结性动词的过去分词表示的就是动作结束后改变了的转态，而不是动作本身（动作已经结束）。

I\'m sure she\'s keeping something back from us.

我肯定她有什么事瞒着我们。

Some teachers find it difficult to keep their classes in order.

有些教师觉得难以维持课堂秩序。

Keep down! You mustn\'t let anyone see you.

蹲下！一定不要让人看见你。

I keep thinking back to the day I arrived here.

我不断回想起刚到这儿那一天的\'情景。

Keep that dog out of my study!

别让那狗进我的书房！

Why oh why do people keep leaving the door open?

人们到底为什么总敞着门呢？