結(jié)合例句子理解更容易：
【The dog主語】 likes to bark.
【這條狗】喜歡叫.
對(duì)主語提問的疑問句：
【什么】喜歡叫?
主語是事物,用what,是人,用who；也可能用【which+名詞】
【W(wǎng)hat 】likes to bark?
【主語】就是【特殊疑問詞本身】,這時(shí),就不需要再用助動(dòng)詞（或者情態(tài)動(dòng)詞、be動(dòng)詞）.
時(shí)態(tài)不作任何變化.
例如：
【Every dog 】has his day.
——What has his day?
【Foxes】 are foxy animals.
——What are foxy animals.
【The black horse 】can run fast.
——【W(wǎng)hich horse】 can run fast?
Jack is a smart boy.
——【W(wǎng)ho】is a smart boy?
【The short player 】plays happily.
——【W(wǎng)hich player】 plays happily?那么請(qǐng)問下面這種情況是否也用WHAT?The bird is king`s friend.對(duì)主語鳥提問時(shí)。你說的很對(duì)！可以用what，句子變?yōu)椋篧hat is king`s friend？