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The food is nice to eat.This book is worth 25 yuan.He is hap

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The food is nice to eat.This book is worth 25 yuan.He is happy to study English.
The food is nice to eat. This book is worth 25 yuan. He is happy .这里的to eat、25 yuan、to study English是什么成分啊?有的说是表语补足语,有的说是状语.到底是什么啊?
还有位朋友说to eat是后置定语。
我不赞同是表语补足语的说法.
补足语的意思是对所补充的内容的进一步说明,表语补足语是对表语to eat那就是对nice的补足.从句意上来理解原句可以改成Eatting this food is very nice!
to eat是后置定语,也可说成to eat the food is very nice!
This book is worth 25 yuan.的句子结构是主+系动词+表语
而这里的 系动词的构成是 be+介词 所以25 yuan是做worth的宾语
He is happy to study English.有俩种理解方式其一是原因状语,译为：他因为学习英语而感到高兴
其二为表语补足语,to study English 是happy的原因的进一步说明.
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再问： 非常谢谢您的回答。可现在有个问题，网上有人说有“表语补足语”，有的说根本没有什么“表语补足语”。所以，我自己也不知道该相信谁？还有，按照一本语法书的说法，worth 25 yuan整个作为表语。
再答： 有表语补足语啊。就是对表语进行补充。比如I am moved,deeply.deeply就是对moved的程度的表达。这里是副词做表语补足。不定式也可以的，只是我一时想不出列子。 还有那个worth的问题。我想是我考虑错了，书上是对的。那就是介词短语作表语。谢谢你帮了我！
The food is nice to eat.This book is worth 25 yuan.He is hap 改为同义句：The food in this restaurant is nice to eat.The food in This book is worth to read The book( )I spent 30 yuan is well worth reading This is the doctor.He came here yesterday.I love to eat food The food is nice to eat.这里to eat是什么成分? This visit cost him 3600 yuan,but he _____ it is worth the m 应该说this is the book he gave me还是this is the book he gave to The book is worth to buy还是The book is worth to be very our all is to food nice eat The book is worth _____ the food is not fit to eat