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period. (主句謂語(yǔ)動(dòng)詞與that從句之間有插入語(yǔ), that不可省略。 ) ? (2)從屬連詞 if/whether。如: I doubt whether he will succeed. 我懷疑他是否會(huì)成功。 I don180。t know if you can help me. 我不知道你能否幫助我。 (3)連接代詞 who, whom, whose, what, which, whoever, whatever, whichever ?連接副詞 where, when, how, why。 如: Who or what he was, Martin never learned. I wonder what he180。s writing to me about. I180。ll tell you why I asked you to e. ? You may do what you will. (1) 介詞賓語(yǔ)從句 賓語(yǔ)從句也可用作介詞的賓語(yǔ)。如: He was deeply displeased by what had occurred that day. I walked over to where she sat. ? I am curious as to what he will say. Your success will largely d