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My question is about adding S to the third person in questions starting by WH or any other type of word not only by do or does.

for instance, which of the following sentences are correct?

  • Is there a national program that teach how to eat healthy?
  • Is there a national program that teaches how to eat healthy?

  • Who in your family is the person who eat most?

  • Who in your family is the person who eats most?
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  • Would you please show your effort first? Such as some relevant grammar rules you've already read.
    – WXJ96163
    Mar 15, 2020 at 5:04

2 Answers 2

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There's no special rule about adding an 's' for questions, it simply depends on the "person" of the verb, e.g.:

Singular                 Plural
1 I teach                we teach 
2 you teach              you teach
3 he, she, it teaches    they teach

If the the referent is singular, e.g. "a national program", use "teaches." If the the referent is plural, e.g. "some programs", use "teach."

Is there a program that teaches healthy eating habits?

Are there programs that teach healthy eating habits?

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if the noun that the relative pronoun refers to is a singular countable noun then you should treat the relative pronoun as you would treat a singular countable noun. the same holds true for plural count nouns as well as uncount nouns. So to answer your question:

is there a national program that teaches how to eat healthy

would be correct since, that refers to a national program, which is a singular count noun, so the relative pronoun, That would be treated as if it were a singular count noun meaning that a singular verb should be used with it.

in the second example:

who in your family is the person who eats most

would be correct.

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