He never gets up before 9o'clock.

Question

In these sentence,Is never is the adverb?
and Is before is the preposition?.What is the preposition sequence in the sentence strucure?
Can I change these sentence structure to
Never he gets up before 9 o'clock or
He gets up before 9 o'clock never?

Answer 1

He never gets up before 9o'clock.
In these sentence,Is never is the adverb?
and Is before is the preposition?. Yes, you are correct about the adverb and the preposition in this sentence.

What is the preposition sequence in the sentence strucure?
There is not only one particular place in the sentence for a preposition/prepositional phrase. They should be placed depending on what they are describing/modifying.

Can I change these sentence structure to
Never he gets up before 9 o'clock or
He gets up before 9 o'clock never?
No, neither of those adverb placements is good. In the first sentence above (He never gets up before 9 o'clock.) the adverb is right in front of the verb, and that's the best place.