Do people usually eat mooncakes on Mid-Autumn Festival?
No,they don't.改为否定句。。还有下面几题：His father has two officesAt the moment ，Tom is playing the piano。你英语很好吗？改为否定句是；People don't usually eat mooncakes on Mid-Autumn Festival.下面两题也改为否定句吗？His father doesn't have two offices.At the moment, Tom isn't playing the piano.