It should be "deserves". "He" is singular.

"Deserves" is correct, but it is only partially because "he" is singular. It is as much because "he" refers to the third person. "I" and "You" are also singular, but they use "deserve." In fact, in the simple present tense, it is ONLY the third person cases that uses "deserves." And that only in the positive form. In the negative form it is also just "deserve" This a fairly common pattern with regular verd in the English language, Only the third person positive requires an s (or sometimes an os", at the end, Every other simple present uses "deserve" no matter who is speaking, how many people are speaking. Once you can flip that around in your head and realize you only have to look out for one particular case. You should be off to a good start. So in the affirmative, It is: 1st Person: "I deserve 2nd Person: "You deserve 3rd Person Affirmative: *He/She/It deserves 3rd Person Plural: We deserve 3rd Person Plural: They deserve And in the negative, notice the only exception is in the same place, third person singular, though it is carried by a different verb 1st Person: I don't deserve 2nd Person: You don't deserve 3rd Person: *He/ She / it doesn't deserve 3rd Person Plural We don't deserve 2 person Plurar: They don't deserve All regular verbs follow this pattern in the simple present, I believe. So the trick is to just develop keen are for what constitutes a singular third person subject. He, she, and, it are obviously pronoun. The way stare at me all day while I am working actually doesn't bother me is correct, because for all the words in "the way you . . . while I am working" it still boils down the pronoun it. I hope that doesn't come off too complicated. You can look at the way I use the verb "to use" in that paragraph above and see it follow the same rules. To walk. To work. Etc . . . These are the verbs with the least tricks up their sleeves.

Deserves😁. Single person=deserves. Multiple people= deserve

SSSSSingular gets the S

deserves