With yes/no questions (is/not, or any binary choice questions) the có is placed at (just before) the part of the sentence where the choice comes in.
An example using English:
'Do you (có) like my car?' 'Can I (có) borrow your car?' 'Is that car (có) expensive?'
It starts as a declaration, có before the choice, then ends with không. There are other ways to ask these questions using ư, but this explains có as well as I'm capable.