什么时侯 to do不定式表目的

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什么时侯 to do不定式表目的？什么时候有别的用法

动词不定式（to do）可以作如下几种状语：

1）目的状语

in order to do sth.

so as to do sth.

to do sth.

2）程度状语（也有说成表示程度的结果状语）

adj./adv. + enough + to do sth.

too + adj./adv. +to do sth.

so + adj./adv. + as + to do sth.（注意不要遗漏as）

such + adj.+ a/an c.n.（单数）/c.n.（复数） + as + to do sth.

3）出其不意/出乎意料的结果

only/never + to do sth.

I arrived at the station only to find the train had left.

对比：预料之内的结果用分词作状语

I slipped, breaking the vase.

the reason什么时候用why

首先纠正一下the reason后面的从句连词只能是why 或是that 不可以有because reason + clause 1) reason+定语从句 a. 关系副词充当定语从句的原因状语，可以用why或that或省略。 The reason I called was to ask about the plans for Saturday. - Longman The reason why（或者that）he doesn't come is that he is ill. ——《英汉大词典》 The reason that [why] he died was lack of medical care. ——《用法词典》 That's one of the reasons he always gets on my nerves. ——《用法词典》备注：关系副词可以用for which代替。 The first question is whether the reason for which Google considered entering the wholesale broadband market in the first place still holds. b. 关系代词充当定语从句的主语或宾语，可以用that或which，与一般的定语从句用法相同。 What is the reason that he gave for this? What was the reason which led the slaves to leave the estates in British Guiana? 2) reason+同位语从句，用that引导。

We decided against installing new heating apparatus, for the reason that it would be too costly. ——《用法词典》 She didn't answer for the simple reason that she couldn't think of anything to say. - Longman 2 reason + for/of/to（小品词） His reason for going back to school is to learn new things. - nhd.heinle.com People give many different reasons for wanting to change jobs. – Longman They must have had a good reason to do it. – Longman The reasons of the German defeat were many and complex. ——《用法词典》 What was the reason for（或者of）him being late？ ——《英汉大词典》备注： reason作“理由，原因”讲时，通常作可数名词，其前常与for搭配；作“充足理由”讲时，为不可数名词，后面多跟不定式。（以下例句来自Longman） The tower is closed for reasons of safety. There was no reason to panic. We have reason to believe that the goods were stolen. Under the circumstances, we had every reason to be suspicious. 这是reason后面接从句的用法希望对你有所帮助祝楼主进步哈