Not what it seems

Good one, you had me for about 10 minutes.

A response to the collection of words is not the answer since these sentences are not questions, but rather each individual sentence is a statement which stands alone, containing the word which is being described.

What has 4 letters.
The word WHAT is made up of 4 letters.

Always has 6 letters.
The word Always is made up of 6 letters.

Never has 5 letters.
The word NEVER is made up of 5 letters.

And sometimes has 9 letters.
The word SOMETIMES is made up of 9 letters.

Edit, you beat me to it, since I took so long to type my response out.