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Should I add a comma after “and”?

If teachers tries to teach less and (, ) students tries to learn from them, it will improve the effectiveness of education.

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teacherJapanIf teachers try to teach less and students try to learn from them, it will improve the effectiveness of education.
teacherJapanShould I add a comma after “and”?

No, definitely not. I wonder whether you meant before "and"? That would be possible (optional).

The sentence as a whole is not tremendously coherent to my mind. E.g. the following would make more sense to me:

If teachers try to teach less, and students try to learn more, this will improve the effectiveness of education.

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Thank you very much for your reply, GPY. I meant to say, “before” and.

Is it absolutely necessary to I use “this” instead of “it?” “It” can represent the content of If-clause, right?

teacherJapanShould I add a comma after “and”?

A comma is required before "and" because the coordinating conjunction introduces a new independent clause.

teacherJapanIs it absolutely necessary to I use “this” instead of “it?”

No, "it" and "this" are both possible. To me, "this" feels a bit stronger in this sentence, but opinions may vary.

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