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When I was searching for information about ''which is vs being'', I found information about this topic. It said that using ''which is'' '' is not idiomatic to use in the following sentence;

sentence a)"Various assumptions must be made during the course of a force analysis reflecting the specific characteristics of the particular system being investigated" _____correct one.

sentence b) "Various assumptions must be made during the course of a force analysis reflecting the specific characteristics of the particular system which is investigated" _______incorrect one

If someone can explain that situation (why ''being'' correct ,''which is'' incorrect? )

I will be thankful.

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Actually, you should offset the clause by a comma when using "which", as in:

Various assumptions must be made during the course of a force analysis reflecting the specific characteristics of the particular system, which is investigated.

This changes the meaning and is probably not what you intend. You could use "that" without a comma, as in :

Various assumptions must be made during the course of a force analysis reflecting the specific characteristics of the particular system that is investigated.

However, "being investigated" is the best choice, because it gives an impression that the investigation is ongoing during the force analysis.

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