Grammatically, yes. It might be more common to say, "She had surgery."
Not quite, it should be, "Do the surgery regardless of whether it is a boy or a girl."
Almost. "Underwent" is clumsy in the past tense, though fine in the present tense. This is more correct: "She underwent surgery on Tuesday. He saw her Thursday, and thought she looked pale, but he did not know she had undergone surgery only two days before. See what I mean?
Surgery is cool
"How are you" is a correct sentence.
I had to go to the surgery yesterday or I had surgery on my stomach
Yes, this sentence is correct.
Laser surgery can correct cataracts. A plastic lense is put permenantly in your eye.
You are palpitating. This is a correct sentence.
With the exception of not capitalizing the 'y' at the start of the sentence, it is a correct sentence.
That sentence is grammatically correct.
no it is not a correct sentence.
no_____If the sentence is You do do that (meaning You are in the habit of doing that) the grammar is perfectly correct and the sentence 'does have correct grammar'.