宾语从句省略和 非谓语动词的区别

Question

在网上听别说从句省略就是变成非谓语，但是某些点不明白
从句： the man who are repairing the road.
非谓语：the man repairing the road.
这个可以理解，去掉that ,那么谓语 are repairing要变成现在分词 repairing 非谓语。 可以理解为省略就是变成非谓语

但是这个就不明白了，
they are the man that i saw yesterday.
they are the man I saw yesterday.
我认为： 很明显就算是省略了that , saw 在句子中还是做谓语啊。我觉得这个才是宾语从句that的省略情况吧

所以，请问写作的时候怎么区分，是宾语从句的省略还是变成了非谓语

Answer 1

the men who are repairing the road 变成 the men repairing the road 正是你说的定语从句（不是“宾语从句”）变为非谓语动词结构。定语从句变为非谓语动词有一个先决条件：被修饰的先行词在从句里做主语。如上例中的 the men 就是从句的主语：the men who were repairing the road。注意：如果从句是被动句型，其非谓语动词形式是过去分词：the men seen repairing the road 的从句是 the men who were seen repairing the road.

但 they are the men that i saw yesterday 可以写成 they are the men i saw yesterday 就不是定语从句变成非谓语结构了。这个省略了关系代词 that/which 的句子仍然是定语从句。定语从句关系代词的省略也有一个先决条件：被修饰的先行词在从句里作宾语。如上面例句的 the men 就是从句的宾语：I saw the men yesterday。