Make a sentence using "which" to add information
My aunt has got a parrot. It can talk. So, we must be careful what we say.
My aunt has got a parrot that can talk, which is why we have to be careful. The bird will repeat what we say!
Meg (only) likes music. She can dance to it. She's good at dancing.
Meg only likes music she can dance to, which is probably why she's such a good dancer.
The shoes were expensive. The shoes were ugly. Sam bought them. Sam is full of himself.
Sam bought ugly, expensive shoes, which I think is evidence that he's full of himself.