check to see if (something is true)

It's a little bit repetitive, but English speakers sometimes use the phrase "check to see". It just means to check something and find out what the situation is. Here are some examples:

Before you pull out, check in your rear view mirror to see if there's anyone behind the car.

I'll check to see if they have one of these at the hardware store around the corner.

This phrase appears in these lessons: