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面從句的 that可省可不省 ,但最后一個(gè) that不可以省 He knows (that) his English teacher is from England and that she has two children. 4當(dāng) that作介詞賓語時(shí), that不可省掉。 .. I didn’t know whether or not he had arrived in Wuhan ④ 主語從句,表語從句,同位語從句句首中只能用 whether,賓語從句中則兩者都可Whether the meeting will be put off has not been decided yet. ⑤ whether可引導(dǎo)一個(gè)讓步狀語從句表示“不管”、“無論”,而 if不能。如: He asked me where we should meet. doubt ? 肯定句中 doubt后跟 if/whether,否定句中doubt后面跟 that. sb. doubts if/whether….. sb. doesn’t doubt that …….