may,can,could,must的肯定否定句应怎么回答?

问题描述:

may,can,could,must的肯定否定句应怎么回答?

may - 肯定回答:might,may 否定:may not
can -肯定回答:Yes,sb can 否定:can't
could -肯定回答:yes,sb could 否定:couldn't
must 肯定:must 否:needn't