I have a reading passage, then a lecturer casts doubt on the reading using three main points. I want to write a summary of the reading and the lecture. Now I want to ask you about this conclusion:

The reading says .... . However, the lecturer mentions.... . the lecturer gives a compelling argument (or compelling arguments ?) to clarify his point view which demonstrate that the lecturer was correct (or true?)

I also want to ask about which in that sentence. Have I used it correctly?

If you know a better way to say that please let me know.

  1. Argument may be either plural, if you are distinguishing several arguments, or singular, if you are speaking of a coherent presentation (which may include many subpoints) tending to a single main point.

  2. Only propositions may be true or false in this sense. An argument is usually valid or invalid, and a position or viewpoint or the person holding it is correct or incorrect. (There are lots of other terms you could use here; you may look them up in a thesaurus and examine actual usage in a corpus such as Google Books or the BYU corpora.)

  3. Which is OK, but your structure puts it in the wrong place; as the sentence stands you are saying that it is the viewpoint (or point of view, but not point view) which demonstrates ..., whereas what you mean is that the argument demonstrates ...

  4. (Not something you asked) The NP the lecturer should not be repeated within the same sentence except for unusual emphasis. Replace it with the personal pronoun.

A couple of possibilities then:

The lecturer clarifies his point of view with a compelling argument which demonstrates that he was correct.
The lecturer offers compelling arguments which demonstrate that his point of view is correct.

Or you could make it even shorter:

His compelling arguments demonstrate that this point of view is correct.

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