He never gets up before 9o'clock.

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?

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.

In the sentence "He never gets up before 9 o'clock," "never" is indeed an adverb modifying the verb "gets up." It describes the frequency or occurrence of the action.

On the other hand, "before" is a preposition in this sentence. It shows the relationship in time between the action of getting up and the specified hour (9 o'clock).

The prepositional phrase "before 9 o'clock" modifies the verb phrase "gets up" and describes when the action takes place.

Regarding the sentence structure, the original sentence follows a typical English word order of subject-verb-object. It is grammatically correct and commonly used.

However, if you want to rephrase the sentence, you can say:
- "Never does he get up before 9 o'clock." This is an example of an inversion structure, where the subject ("he") and the auxiliary verb ("does") are inverted to create emphasis.
- "He never gets up before 9 o'clock," emphasizes the adverb "never" without any inversion.

Remember, both of these alternative structures are grammatically correct and convey the same meaning but with a slight emphasis difference.