It's difficult to make sentences or phrases :)

You're welcome.

Sounds better, also easier to write. :)

It’s on your back side.behind you.

Back side in English usually's a polite way to refer to someone's bum. At least here in Canada. I believe you want behind instead. :P

It’s the right answer.

While correct. It's a little awkward. It's simpler to say;

That's right.

or

That's correct.

You can see the building on your left side.

You can also write it as;

You can see the building to your left.

or

You can see the building on your left.

I say it.

I don't quite get what you mean with this. (??????)

It's very simple sentences and phrases below The sentences and phrases below are very simple, but it's difficult for me to make those ones them.