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Sentence Correction: Parts of Speech - Noun/Adjective vs. Verb+ing

Many people envy those who work from home, but what these people do not realize is that working from home requires being disciplined.

Good!

Verb+ing can be used as a noun replacement only when there's no actual noun. Since there is a real noun - discipline - it is preferable to being disciplined.

This answer choice repeats the original Parts of Speech mistake: verb+ing can be used as a noun replacement only when there's no actual noun. Since there is a real noun - discipline - it is preferable to being disciplined.

In addition, this answer creates a Subject Verb Agreement mistake: those who works.

While this answer choice corrects the original Parts of Speech mistake, it creates a Subject Verb Agreement mistake: those who works.

This answer choice repeats the original Parts of Speech mistake: verb+ing can be used as a noun replacement only when there's no actual noun. Since there is a real noun - discipline - it is preferable to being disciplined.

In addition, replacing the word but with so changes the meaning of the original sentence and creates an illogical sentence.

work from home, but what these people do not realize is that working from home requires being disciplined
works from home, but what these people do not realize is that working from home requires being disciplined
works from home, but what these people do not realize is that working from home requires discipline
work from home, but what these people do not realize is that working from home requires discipline
work from home, so what these people do not realize is that working from home requires being disciplined