Word orders

Hi all! I am really confused now, and I can't put the words in the correct order. I'd just like to ask you to correct them.

positive forms:

a. He reads his books.

b. They swim in the swim ing pool.

negative forms:

a. He does not read his books (or) he doesn't read his books.

b. They do not swim in the swimming pool (or) they don't swim in the swimming pool.

interrogative forms:

a. Does he read his books?

b. Do they swim in the swimming pool?

negative interrogatives:

a. Does he not read his books? (Or) doesn't he read this books?

b. Do they not swim in the swimming pool? (Or) don't they swim in the swimming pool?

are these correct? I wait for your answers and comments from you, thanks in advance!