China China?

Today in my Week 7 Chinese lecture we were learning negation of certain verbs. One of those verbs was "yao" or something, meaning "to have to do" (not 100% sure i'm sorta guessing).

Anyway, the funning thing was that the negation wasn't "bu yao" as is for regular verbs, but suddenly became "bu bi". And so the lecturer was there screaming her head off saying BOOBIE BOOBIE BOOBIE and wondering what was so funny.

Haha I am so silly.