英语语法问题

Question

The teacher did what he could (to help)his students with English

为什么要用to help?

Answer 1

the teacher did what he could do to help his students with English.
老师尽他所能帮助学生学英语。What he could do 是指它所能做的一切，do 被省略，因为前文出现了did. to help his students with English 是目的状语，表达老师近其所能的目的是帮助学生学英语。

Answer 2

整句话是这样：
The teacher did something to help his students with English.

what he could （do）= something

这个老师做了他所能做的，去帮助学生的英语学习。

to help ...是动词不定式作目的状语。

I do sports to lose weight. 我运动是为了减肥。

Answer 3

把这个句子变一下你就明白了：To help is students with English，the teacher did what he could.
what he could在句中做did的宾语，动词不等式在句中做目的壮语。本回答被提问者采纳

Answer 4

to help 指的是 did
与could无关