英语 选择性必修 第四册[WY] Section Ⅱ Using language—Grammar & Integrated skills Grammar 名词性从句(复习) ①Whether it is true remains a question. ②The question is whether it is worth doing. ③It is possible that caffeine may cause birth defects in humans, too. ④She asked me whether/if I had returned the books to the library. ⑤There was no suggestion that he was doing anything illegal. ⑥My reason is that the cost will be too high. (1)whether在①句中引导_____从句；在②句中引导_____从句。 (2)③句中that引导_____从句，_____作形式主语，that不作从句的任何成分，但通常不可省略。 (3)④句中whether与if都引导_____从句。whether与if引导宾语从句时，大多数情况下可以互换。但or not前面用_____；用于介词后的宾语从句用whether引导。 (4)⑤句中that引导_____从句，不作从句的任何成分。 (5)⑥句中引导表语从句的that不作从句的任何成分，通常_____。 答案：(1)主语 表语 (2)主语 it (3)宾语 whether (4)同位语 (5)不可省略 (一)名词性从句的连接词 名词性从句包括主语从句、表语从句、宾语从句和同位语从句。 1．that (1)that只起连接作用，引导名词性从句，在从句中不作任何成分，本身也没有词义。 That he is still alive is sheer luck. 他还活着全靠运气。 John said that he was leaving for London on Wednesday. 约翰说他星期三要去伦敦。 (2)that在引导名词性从句时，常可省略；但在以下情况中，that不宜省略。 ①that引导的主语从句位于句首时，that不可省略。 ②当动词后带有两个(以上)并列的宾语从句时，引导第二个(以上)从句的连词that不可省略。 ③当that引导的宾语从句前有it作形式宾语时，that不可省略。 ④that引导的从句作介词的宾语时，that不能省略。 ⑤引导表语从句和同位语从句时，that一般不可省略。 The teacher told the students (that) they should hand in their homework the next day and that the homework must be signed by their parents. 老师告诉学生要在第二天交作业，而且作业必须由家长签名。 The fact that he has fully recovered makes me feel good. 他已痊愈，真让我高兴。 2．whether/if (1)whether，if引导的名词性从句是由一般疑问句或选择疑问句转化而来的；引导从句时，只起连接作用，在从句中不作任何成分，意为“是否”。 (2)whether和if大部分情况可通用，但在下列情况下，只可用whether: ①whether引导主语从句并放在句首。 ②引导表语从句和同位语从句。 ③whether从句前有介词。 ④从句后有“or not”。 ⑤后接动词不定式时。 Whether there is life on the moon is an interesting question. 月球上是否有生命是个有趣的问题。 The question is whether she should have a low opinion of the test. 问题是她是否应该对这次测试有较低的评价。 Everything depends on whether we have enough money. 一切取决于我们是否有足够的钱。 选词填空(that/whether/if) ①_____ the college will take in more new students this year is true. ②I'm not sure about _____ he will come. ③The students asked the question _____ the book was worth reading. ④Let me know _____ or not you can come. ⑤I don't know _____ he still lives there after so many years. ⑥Give me your promise _____ you will come to our party this evening. ⑦We are interested in _____ you will attend the meeting. ⑧He has made it clear _____ he will not give in. 答案：①That ②whether ③whether ④whether ... ...
