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问题: 不定式!

you couldn't tell lies to help him.

在这个句子中 怎样解释不定式作让步状语!!

解答:

you couldn't tell lies to help him.

在这个句子中 怎样解释不定式作让步状语!!
“退一步说,就算是为了帮助他,你也不应该撒谎。”
作状语的不定式
1)目的状语 
To… only to (仅仅为了), in order to, so as to, so(such)… as to… (如此……以便……)
  He ran so fast as to catch the first bus. 他飞快地跑以便赶上第一班车。
  I come here only to say good-bye to you. 我来仅仅是向你告别。

2)作结果状语,表事先没有预料到的,要放在句子后面。
  What have I said to make you angry.
  He searched the room only to find nothing.
这个应该就是你所想等到的解释。

3) 表原因
  I'm glad to see you.