grammar - Why do we put subject and auxiliary verbs at the end of the sentence?

Why do we put subject and auxiliary verbs e.g., have, be, do at the end of the sentence?
I found this kind of sentences from a fantasy book named The last apprentice by Joseph Delany.

Examples:

1. Got what I need, you have.


2. Bossy and arrogant, he is.


3. Try to help her, I did.