Grammar Correction

1. Does he like the blue car?

2. Does he likes the blue car?

A little confused with these two [if you omit "two", it means more than two] sentences. I know that when the subject is singular the verb, "like" s) should also be in singular form (that is "likes")., but However, my student is contesting arguing that the verb should be have [notice that is "have" NOT "has"] in the plural form (like) an ess/'s' appended to it  since the sentence is interrogative. So which sentence is correct? now number 1 or 2.

Your answers will be are of most valuable value to me. Thanks.

Just remember the rule that after verbs like, "do", "does", "should", "shall", "can", "must" etc the verb form should be in plural!  By plural I mean, no 's' after the verb.

She likes him    -- singular verb form (has an 's')

They like him    -- plural verb form.   (no 's').

She should like him.

She does indeed like him. [without "indeed" sounds strange"

I don't remember the exact technical reason etc.  Just remember this rule.  This what makes English so difficult.  Too many exceptions.  So you are correct and your student is wrong!