They do what they can to help others.为什么不是They do what they can do to help others?what they can 是什么成分?为什么不要加第二个do?

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They do what they can to help others.为什么不是They do what they can do to help others?what they can 是什么成分?为什么不要加第二个do?

They do what they can to help others.为什么不是They do what they can do to help others?what they can 是什么成分?为什么不要加第二个do?
They do what they can to help others.为什么不是They do what they can do to help others?
what they can 是什么成分?为什么不要加第二个do?

They do what they can to help others.为什么不是They do what they can do to help others?what they can 是什么成分?为什么不要加第二个do?
第一个do和第二个do意义相同,但是第一个do不可省略,第二个do经常省略,是为了避免用词重复.写出来do不如省略掉更自然.

其实加do和不加do都对。这两者没有区别，只不过习惯上省略do的情况较多。

what they can是定语，第二个do省略

what do they do they what do they do? They shall do what they what()they()they()there?what()they()they()there?[do] what do they What do they what do they What do they need? what animals do they they/have/what/do/(?) what do they what do they do?(工程师) do they say what they would What do they doing?是What do they like doing？ What can't they do　还　 what they cant do? What ___ do they like? What are they( )(do)now what will they do firt