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I'm unsure, in the sentence, since the "to be" verb is applying to homework, but comes after a plural, which is used?

What classes is the homework for?

What classes are the homework for?

3

The verb always agrees with the subject, regardless of word order.

You have correctly identified the subject of the sentence as "homework", which is a singular collective noun. So, you should use the singular form of the verb: "What classes is the homework for."

It may sound strange, because the word order is inverted and the verb comes after a plural noun, but the subject-verb agreement is all that matters. It may help if you think about answering the question, so that the word order goes back to normal:

"What classes is the homework for?"

"The homework is for classes A and C."

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