Verbs – Use of -s on Third Person Verbs in Questions Starting with ‘Does’

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I was watching this video about Cyclopia on youtube and noticed this sentence: How does an animal that normally has two eyes develop just one in the center of its face.

I tried to google it but I couldn't find an answer, and it's really nagging me. So, shouldn't it be "develops" being the subject of the verb "an animal"? Btw, I also heard someone saying "It doesn't seem safe", instead of "It doesn't seems safe" in a movie. Can someone explain to me the proper usage, and if you can keep it simple, please… I'm not a native speaker, and most of my English I learned from watching movies and tv shows, I'm just now trying to learn about grammar and stuff.

Ps: Was this post to lengthy? That's my first time here on stackexchange and I'm not really sure how I should approach writing my questions.

Best Answer

When you use an auxiliary verb for a third person, the main verb loses its 's.'

He walks toward a church
He does walk toward a church.

However, this change doesn't happen in first person; because, there is no 's' in the verb.

I walk toward a church
I do walk toward a church.

Especially when you are forming a question, the auxiliary verb is mandatory.

He walks toward a church? ~ Not a preferred structure as a question.
Does he walk toward a church? ~ Preferred structure

Why? Well, the questions are formed that way only.

It doesn't seem safe

You don't put 'seems' there because, as I said, when you put an auxiliary 'does' there, you remove 's' from the verb. Remember that way - the main verb's 's' is eaten by the auxiliary verb. But remember, this is not always a case.

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