关于疑问代词单复数,语法书上说可用作单数也可用作复数.
那么,
疑问代词后加可数名词,名词单复数由什么决定?
eg：what problems do you think it has cause?
what sport do you like best?
疑问代词做主语,谓语单复数由什么决定?
which is your favourite?
which are yours?