一般疑问句：Did lucy do her homework at home?
疑问句：What did lucy do at home?
否定句：Lucy didn't do her homework at home.
一般疑问句：Did he find some meat in the fridge?
疑问句：What did he find in the fridge?或Where did he find some meat?
否定句：He didn't find any meat in the fridge.