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For example, which of the following is correct?

I am a teacher who likes teaching.


I am a teacher who like teaching.

marked as duplicate by user178049, Rompey, P. E. Dant, Varun Nair, shin Aug 1 '17 at 7:49

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  • Teacher" is 3 sg, so the verb should match it: "likes" is thus correct – BillJ Jul 31 '17 at 18:46

The verb here is governed by the pronoun used. In English, who can be both singular and plural.

Since there is no way to tell the number of that pronoun from the bare pronoun itself, you have to look at the original noun it points to.

If the subject noun is singular, make it singular.

I am a teacher who likes teaching.

If the subject noun is plural, make it plural.

We are teachers who like teaching.

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