I can't find my pen.

I need a new pen. I'll buy one.

I have a new pen; I'll lend it to you.

Are there any pens in the car?

I need an envelope, a piece of paper, and a pencil or a pen.

I have no pen to write my letter with.

Are there any pens on the desk?

There are no pens on the desk.

There is a pen on the desk.

There are two or three pens on the desk.

There is a pen between the apple and the book.

If you need a pen, I'll lend you one.

If you need a pen, I'll lend you one.

If you don't have a pen, use a pencil.

Then the pen fell from my hand and I just listened.

If you need this pen, I'll lend it to you.

I misplaced your blue pen.

If you want this pen, I will lend it to you.

If you need a pen, I'll lend you one.