помогите пожалуйста , я не разумею

Apples aren't expensive, are they?
We won't buy any fruit today, will we?
Paris isn't the capital of Portugal, is it?
You wouldn't like to be a dentist, would you?
The Smiths don't travel much, don't they?
Your parents haven't been abroad, have they?
Little Billy doesn't go to school yet, does he?
Teachers shouldn't be too strict, should they?
You didn't arrive on time, did you?
Our neighbours can't drive, can they?