1.This is the book for___I paid 10 yuan

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1.This is the book for___I paid 10 yuan
空中应填which,做paid的宾语,同时前面是for,故不能省略,形成介宾结构
同样的再看这个句子：2.He's bought a cottage in the country for___he retires,with the money he's saved over half of his life
A.when B.where C.what D.which
此句答案是A,我选的是B,我的理由是：the country做retires的状语,所以应填where,可老师给的解释是：for后的宾语是一个句子,故要翻译成“当他退休的时候,他在村里买了个房子”所以用when,可如果这样的话,第一个题for后不也跟的是一个句子吗?到底怎么判断介词后的宾语是句子还是词?
3.----Have you finished the book?
---No,I've read up to___the children discover the secret cave
A.which B.what C.that D.where
此句为什么从句?跟以上两个题有什么区别没有?

1.你分析地对.确切地讲, which在从句里是介词for 的宾语,即：I paid 10 yuan for this book. 整个从句是定语从句,修饰the book.
2. for 在这里也是介词,意思是“为了”,意思是：他用半辈子积攒的钱在乡村买了房子,是为了退休的时候用,其实如果改成：He's bought a cottage in the country for his retirement,...就更加容易理解了.介词后面是句子还是词,主要判断方法是看这个介词在后面的句子中是否有作用,比如第一句paid for this book,就有用.而第2句,for在从句里没有任何作用,when he retires 只能做for的宾语从句.
3. to 仍然是介词,答案应该是D. where,道理和第2句一样,where the children discover the secret cave是介词to的宾语从句：“我读到孩子们发现秘密山洞那儿了.”
再问：第二句怎么知道是宾语从句的...从句不是在名词后吗?
再答：从句when he retires的确是在介词for 的后面呀： He's bought a cottage in the country for when he retires.

1.This is the book for___I paid 10 yuan I paid 10 yuan for this book . 同义句 He paid 10 yuan for the book.同义句 He__10yuan__ __ the book. I paid 20 yuan for this book.= This book ＿＿＿＿ 20 yuan. She paid 10yuan for this book她花了10元购这本书划线部分提问 1.the boy is at home 2.this book is five yuan this is the book _____which I spend 5 yuan. The book is 10 yuan.The ruler is 2 yuan.The pen is 8 yuan.Th i paid 5 yuan for the book 同义句 i paid 10 yuan for the new book.对划线部分提问划线部分为10 yuan The price of this book is 15 yuan .对15yuan提问. I paid 20 yuan for the new book.(改成同义句) I ______ 20 yuan ___