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Sentence Correction: Pronoun Questions - To do so/doing so

Is the following sentence correct?

John plays tennis every day. He enjoys it very much.

You're right.

How about this sentence:

John plays tennis every day. He enjoys doing it very much.

This sentence is grammatically incorrect. A pronoun - in this case, it - can refer to a previously mentioned noun. It cannot refer to a previously mentioned verb (in this case, plays).

Okay, so how about the following sentence:

John plays tennis every day. He enjoys doing it very much.

Still incorrect because of the same reason. A pronoun (it) cannot refer to a previously mentioned verb. The correct way of referring to a previously mentioned verb is to use the phrase to do so or doing so. Therefore, the correct form of the above sentence is as follows:

John plays tennis every day. He enjoys doing so very much.

Very good! This sentence is still incorrect because of the same reason. A pronoun (it) cannot refer to a previously mentioned verb. The correct way of referring to a previously mentioned verb is to use the phrase to do so or doing so. Therefore, the correct form of the above sentence is as follows:

John plays tennis every day. He enjoys doing so very much.

The sentence is still incorrect because of the same reason that the first sentence was incorrect. A pronoun (it) cannot refer to a previously mentioned verb. The correct way of referring to a previously mentioned verb is to use the phrase to do so or doing so. Therefore, the correct form of the above sentence is as follows:

John plays tennis every day. He enjoys doing so very much.

Yes
No

I don't know

This one is correct.
Still incorrect.

I don't know

Still incorrect.
This one is correct.

I don't know