看一下下面的几个句子帮分析一下To have a healthy diet keeps us fitTo finish your homework on time every day is your dutyTo practice as much as possible is useful for our English learningThe escaped prisoners were finally caught为什么

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看一下下面的几个句子帮分析一下TohaveahealthydietkeepsusfitTofinishyourhomeworkontimeeverydayisyourdutyTopracticeasm

看一下下面的几个句子帮分析一下To have a healthy diet keeps us fitTo finish your homework on time every day is your dutyTo practice as much as possible is useful for our English learningThe escaped prisoners were finally caught为什么
看一下下面的几个句子帮分析一下
To have a healthy diet keeps us fit
To finish your homework on time every day is your duty
To practice as much as possible is useful for our English learning
The escaped prisoners were finally caught
为什么前三个句子有动词不定式 最后一个句子用过去分词作定语?

看一下下面的几个句子帮分析一下To have a healthy diet keeps us fitTo finish your homework on time every day is your dutyTo practice as much as possible is useful for our English learningThe escaped prisoners were finally caught为什么
1.前三个to do 就是不定时,不定时是英语中一种非谓语结构,可以做主语、宾语、定语等等,但是不能做谓语,所以叫非谓语,不定时也有两种结构,一种是加to的,一种不加to,比如,I let you go.go就是不加to的不定时,简单地说就是因为动词一般都是做谓语,为了使动词做其他的句子成分,就发明了不定时这些非谓语结构,比如I let you go 中的go就是宾语补足语,而不是谓语.
2.escaped 是escape的过去分词,动词的过去分词形式可以充当形容词的作用,英语中除了形容词外有很多词性可以充当形容词来修饰其他的词,比如名词也可以.
所以上面两种形式都是一个词没有做他本来的工作而去跨界干别人的事情,所以就有了这些不同的结构.

前面的to do形式全部是作为句子的主语,而最后一句的主语为prisioners,过去分词escaped只不过作为定语修饰prisoners.两者在句子的作用根本不同

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