Question

不定式作后置定语？

不定式作后置定语：His office was the next room to clean, 还是 His office was the next room to be cleaned？请问哪一种表达是正确的？

Answer 1

一般来说，动词不定式作后置定语时，它与名词之间是主谓关系或动宾关系，所以这两句话都是正确的。
当动词不定式作后置定语的时候，要放在被修饰的名词之后，如果它与名词之间是动宾关系，则叫做反射不定式。反射不定式后面也可以有介词，但这里的介词是不能省略的，但可以把介词提前，在介词后面放一个关系代词whom或which，如果名词指人，就用whom，如果名词指物，就用which。

Answer 2

不定式分句的逻辑主语是next room，next room是动作clean支配的对象，所以句子必须是His office was the next room to be cleaned。to be cleaned的隐性语法结构是for a next room to be cleaned，to be cleaned是后置限制性非限定关系分句。

Answer 3

这个句子到底是用to clean 还是to be cleaned 取决于谁打扫，如果是他自己打扫就用 to clean,如果别人打扫就用to be cleaned.

Answer 4

用“人”作主语时（执行者），
动词不定式作定语时，一般不用被动式。偶而也有被动式出现，但意思不一样的。
I have a lot of work to do. 我有很多工作要做。（工作我做的）
I will go shopping. Do you have anything to be bought?（东西被买，不是“你”买）
加“逻辑宾语时”用主动式。
His office was the next room for her to clean.
但这两个句子主语不是“人”，而且没有逻辑宾语，所以，个人觉得都可以用的。
His office was the next room to clean.
His office was the next room to be cleaned.