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主语从句的连接词知识网络难点突破 引导主语从句的连接词主要有三类： 连接词 that，whether； 连接代词 what，who，whose，whatever，whichever，whoever等； 连接副词 when，where，why，how等。 1．连接词that，whether引导 That the college will take in more new students this year is true． 今年这所大学将招收更多新生是真的。 Whether he can finish his task on time is of great importance． 他是否能按时完成任务非常重要。 注意：（1）if不能引导主语从句。 （2）形式主语it替代主语从句。常见的it替代主语从句的句式主要有以下几种： ① It+系动词+形容词+that从句。如： It is quite clear that the whole project is doomed to failure． 很清楚，整个计划注定要失败。 ② It+系动词+名词+that从句。如：It is our hope that the two sides will work towards peace． 我们的希望是双方能朝着和平的方向发展。 ③ It+be+v．ed形式+that从句。如： It is announced that the plan has been successfully carried out． 据宣布计划已经顺利实施。 2．连接代词引导 What we can’t get seems better than what we already have． 我们得不到的东西似乎比我们拥有的东西好。 who the letter was from is still unknown． 这封信是谁寄出的还不清楚。 Whichever of you gets here first will get the prize． 你们当中第一个到达这里的人将获得奖项。 3．连接副词引导 How acupuncture reduces and relieves pain is unclear． 针灸是如何减轻和解除疼痛的还不清楚。 why dinosaurs suddenly disappeared still remains a mystery． 恐龙为什么突然消失了还是个谜。 1. struck me most in the movie was the father’s deep love for his son. A. That B. It C. What D. Which 2．From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water. A. why B. how C. because D. whether 3．We should respect food and think about the people who don’t have________we have here and treat food nicely. A．that B．which C．what D．whether 4．Cindy shut the door heavily and burst into tears.No one in the office knew________she was so angry. A．where B．whether C．that D．Why 5．As a new graduate，he doesn’t know ________it takes to start a business here. A．how B．what C．when D．which 【答案与解析】 3. C 【解析】句意为：我们应当重视食物，珍惜食物，并应为那些没有我们所拥有的食物的人们作些考虑。that引导名词性从句时不作句子成分，而此处引导词须作宾语从句中的宾语，故that不合适；which和whether的含义与句意不符；what引导宾语从句并在句中作宾语，符合句意。 4. D 【解析】句意为：Cindy用力关上门并且大哭了起来，办公室里没人知道她为什么那么生气。本题考查宾语从句，且从句中缺少状语，根据句意分析，D项正确。 5. B 【解析】句意为：作为一名新的毕业生，他不知道在这里创业需要些什么。what在宾语从句中充当takes的宾语。本题可采用句式还原法解题，只要把宾语从句还原成It takes...to do sth.句式，即可轻松得出答案。 
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