did you notice..
in the earlier books, i think till PoA, Rowling used these phrases to a massive extent, most often spoken by the trio:
"....they would, wouldn't they?"
"...they did, didn't they?"
"....it is, isn't it?"
"....he would, wouldn't he?"
they irritated me so much that I even started predicting that this sentence will end like this and it always actually did. however, she stopped using these after PoA or atleast toned them down a bit so they weren't that noticeable. by the end of the book 7, i think i hardly saw these again.