Using "S" at the end of word with does

Anonymous"The man looks like he's tired"vs"The man does look like he's tired"I'm asking if when we use "does" in the sentence, we don't use plural anymore?

There is no plural in your first sentence.
The "third-person singular" (he, she, it, the man, an elephant, etc.) takes an S ending in regular verbs. It is the singular form, NOT the plural.

Yo

So the second sentence is not correct? It should be "The man does looks like he's tired" if I use "does"?

"The man looks like he's tired" Looks here is a verb, It is the third-person singular of the Simple Preset tense.

vs

"The man does look like he's tired" The third-person singular of the Simple Present tense can also be formed
by the third-person singular of the auxiliar

Does is also often used to show emphasis/confirmation or contradiction.

He looks tired.
Yes I agree; he does look tired.

You don't think that it looks like him but it does look like him.

I wouldn't say say he looks tired.
Well to me does look tired!

AnonymousSo the second sentence is not correct? It should be "The man does looks like he's tired" if I use "does"?

The second sentence was correct as written.

When you have a form of "to do" (does he, did he, he does, he did, doesn't he, didn't he), the main verb stays in its bare form ("look").

Please read my post and Clive's post again.

AnonymousI'm asking if when we use "does" in the sentence, we don't use plural anymore?

Right. Except on a verb, the "s" doesn't mean it's plural, so you should state it like this.

When we use "does" in a verb phrase, we don't use "s" on the other verbs in the verb phrase.

See

CJ