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?
She had underwent knee operation is not correct. Here had is not required in the sentence.
no it is not a correct sentence.
This is not a sentence it is a phrase and as a phrase it is correct.
The sentence, "They are going to the beach." is correct.
This sentence is not grammatically correct. For the sentence to be grammatically correct, the space between "in" and "to" would have to be removed. Therefore the sentence should read "They are into skating."
Yes, "Who are you?", is a correct sentence.
Had the surgery
Had the surgery
Grammatically, yes. It might be more common to say, "She had surgery."
The past tense of 'undergo is 'underwent' I underwent major surgery. The past participle of 'undergo' is 'undergone' After I had undergone major surgery I felt much better,
Underwent is a verb, the past tense of undergo.
She underwent rehabilitation after her knee surgery to regain strength and mobility.
Not quite, it should be, "Do the surgery regardless of whether it is a boy or a girl."
topic sentence
He underwent surgery for his orbital bone(Forehead). He should be back by Summerslam.
Last week he underwent laser eye surgery.
Elie underwent surgery on her knee to repair a torn ligament.
He underwent wrist surgery this year and is scheduled to return sometime this year.