Question

请问这个定语从句中的谓语在哪里

The professor can hardly find sufficient grounds on which to base his argument in favor of the new theory.在这个句子里面有个定语从句，on which to base his argument in favor of the new theory.在这个定语从句中，to base 是接在哪里，这个定语从句中没有谓语？ to base 是什么结构？

Answer 1

严格地说，on which to base...这是个不定式短语，所以其中没有主语和谓语。但是这个不定式短语是相当于定语从句来用的。

4）“whword＋不定式”结构不定式前加一个疑问代词（what, which, who, whom, whose）或疑问副词（where, when, how, why），以及连词whether构成特殊的不定式短语，其作用相当于一个从句，这样的不定式短语常在某些动词后面作宾语。

常见的可以接这种不定式短语的动词有：

know, see, decide, tell, ask, consider, discover, explain, findout, forget, guess, hear, imagine, inquire, learn, observe, perceive, remember, think, understand, wonder等。

【例如】

i couldn’t decide which book to choose.
i can tell you where to get this book.
they found it hard to decide whether to go swimming next sunday or to visit aunt sally in new year. “whword+不定式”结构除了作宾语外，还可以在句中作主语或者表语。

Answer 2

我认为 应该把 which 去掉 把on 放在 his argument 后面 这是base sth on sth句型
The professor 是主语
can hardly find 是谓语
sufficient grounds 是宾语 不定式 短语 作定语修饰 sufficient grounds
to base是不定式 his argument 是不定式的宾语 on 是介词 其宾语 就是 不定式所修饰的词
不定式短语 作定语 与所修饰词 是动宾关系
in favor of the new theory.是状语

如果是定语从句 应该是
The professor can hardly find sufficient grounds on which he will base his argument in favor of the new theory.

定从的谓语是will base

Answer 3

不是定于从句
翻译：这位教授很难找到足够的理由和依据的理论来支撑他的论点

base sth. on sth.这个词组的意思应该是"把...建立在...基础之上,某事物以另一事物为依据"这个句子可以分解为: The professor could hardly find sufficient grounds to base his argument in favor of the new theory on (sufficient grounds).用 which 指代suffficient grounds 那么介词on 就要放在 which前面.

which to base就是连接代词或副词+不定式，那么 to base就是不定式结构
如：
I couldn't decide which one to buy.

Answer 4

base his argument on grounds