因?yàn)榫涫侵髡Z(yǔ)從句,what 既可以引導(dǎo)主語(yǔ)從句,并且又可以在從句中作成分,what在本句的主語(yǔ)從句中作主語(yǔ).而which, as, that 引導(dǎo)的是定語(yǔ)從句,并且前面必須有先行詞,而what前面不用先行詞,即 先行詞+ that / which = wh...什么是“先行詞”老師能舉個(gè)例子嗎？先行詞是定語(yǔ)從句中被修飾的名詞，如 This is a book that he gave me. 這是他送給我的書。這句中的book就是先行詞。 你上面的句子，其實(shí)也可以加上一個(gè)先行詞，然后用that或which 引導(dǎo)，變成定語(yǔ)從句，即 In some countries the schools that are called 'public schools' are not owned by the public.