加系动词是变被动语态，不加就是直接的主动语态，放在句子里就会需要主语和宾语调换顺序。还有一些是固定搭配，沿用古英语所以一般不加以改动
介词前面加动词什么形式比如说be dovoted to,be engaged in为什么不能直接是engage in
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