真正英语语法高手请进【The students 】【decided to do what they can 】【help

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真正英语语法高手请进
【The students 】【decided to do what they can 】【help the poor old man.】
在各个改错题目我是这样划分的,在help后面加to 为一个目的状语,
可这部分：
decided to do 【what they can 】这里面的【what they can 】的谓语呢?怎么理解这句话?
麻烦分析下上面例句的语法结构

1.楼主改法正确,的确是在help前面加上一个to,以该不定式短语to help the poor old man做句子的目的状语.
2.该句中do后面的宾语从句what they can中,它省略了一个谓语动词do,因为它和主句decided to do中的do相同,所以使用了省略.
即完整的句子为：
The students decided to do what they can do to help the poor old man.
3.句子成分分析：
1）主句：
主句主语：The students
主句谓语：decided
主句宾语（不定式短语做宾语）：to do what they can (do)
主句的目的状语：to help the poor old man
2）宾语从句：what they can (do),此句结构简单,恕不分析.

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