- Let's discuss this with him
- Let's discuss with him
are both of them grammatically correct?
A grammar checker pointed out a flaw in "Let's discuss with him" and suggested adding "this" mentioning "correcting pronoun usage"
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As the comment by FumbleFingers indicates, the verb "discuss" is usually used in a transitive sense in English, where the topic of discussion is mentioned, as in
- Let's discuss the problem with him.
- Let's discuss this with him.
That sort of use is the normal and common use of "discuss".
It is possible to use that verb intransitively, as in:
Let's discuss with him.
that usage is grammatically valid, and is used under some circumstances. The meaning is slightly different, as that form indicates a general discussion, or perhaps that the subject was previously mentioned and is already known to the listener. This usage is acceptable, but is significantly less common among fluent speakers.