keep sb doing怎么改被动语态？请例句示范
-> A girl is kept doing nothing in a shop. 女孩在店铺里被安排闲着。
另外,Mr.Li keeps us interested in Maths.
可以改成:We are kept to be interested in Maths.吗?为什么?
-> We are kept interested in Maths. by Mr. Li.
-> 因为 keep + to be 不是词语之正常搭配，而且原文是 keeps us interested 并不是 keeps us to be interested ，所以不用 We are kept to be interested in Maths.
-> 词语之正常搭配是 keep + 动词-ing
-> 参考资料列出更多的例子。
参考资料：http://www.radiier.info/a/node/87