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I sometimes am confused as to how to answer that kind of questions as above. Help

Q: Is he doing his homework?

A: Yes, he is doing his homework.

Q: Is the pen working?

A: Yes, it works.

I know the verb forms in the 1st and 2nd sentences are not exactly congruous in terms of its functional ramifications, but sometimes, I think just the present form will suffice and more acceptable than the present contiuous form when being asked with the questions in present continuous.

Also, can the word "homework" mean a "homework" in general sense and can function as a sort of mass noun here like homeworks in Math, History, etc., all inclusive?

Can the colored phrase can be changed to "sort of a mass noun"?
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Hi guys,

In real-life situations, we'd normally just give a short answer to such questions.

Q: Is he doing his homework?

A: Yes, he is doing his homework. Yes, he is.

Q: Is the pen working?

A: Yes, it works. Yes, it is.

Best wishes, Clive
Comments  
I sometimes am confused as to how to answer that kind of questions as above. Help

Q: Is he doing his homework?

A: Yes, he is doing his homework. fine

Q: Is the pen working?

A: Yes, it works. fine It's also correct to say "Yes, it's working" or "Yes, it is working."

I know the verb forms in the 1st and 2nd sentences are not exactly congruous in terms of its functional ramifications, but sometimes, I think just the present form will suffice and more acceptable than the present contiuous form when being asked with the questions in present continuous.

Also, can the word "homework" mean a "homework" in general sense and can function as a sort of mass noun here like homeworks in Math, History, etc., all inclusive?

Yes. Homework is homework whether it is one assignment in one subject or five assignments in five subjects. Homework is not a countable noun. People talk about a homework assignment or homework assignments, not about homeworks. (Assignment is a countable noun.)
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 Clive's reply was promoted to an answer.

Present Continuous
Is he doing ...

Q. Is he doing his homework?

A. Yes, he is. That's enough.

Q. Is the pen working?

A. Yes, it is.

Students: We have free audio pronunciation exercises.