in case万一。是连词，引导条件状语从句。也就是说in case后面是一个完整的句子
Take a hat with you in case the sun is very hot. 倘若太阳很利害，你就把帽子戴上。
in case of的of是介词，介词后面只能带名词性质的词，比如名词、代词等。意思和in case差不多，万一的意思
In case of rain they can't go. 万一下雨，他们就不能去了。
in the case of，就...来说, 关于。意思跟上面两个不一样了。一般表示转而提及另一件事情。比如 In the case of woman，they have more difficulty in their job。就女性来说，她们在工作中会遇到更多的困难
We have an auxiliary generator in case of power cuts.
我们有一台万一断电时使用的备用发电机。
2. In case you need something, please don't hesitate to let me know.
如果你需要什么东西，请不客气地对我说。
3. It may rain you'd better take an umbrella (just) in case (it does).
可能下雨--你最好带把伞, 以防万一（下起来）.
4. In case that he leaves, please inform me.
如果他离开, 请通知我。
5. In case of rain, they can't go.
万一下雨，他们就不能去了。
6. In case (=If) I forget, please remind me.
万一我忘记，请提醒我。
7. Write the telephone number down in case you forget.
把电话号码写下来以免忘了。
8. The doctor asked us to call him during the night except in case of necessity.
医生吩咐我们，除非必须，否则不要在夜里叫他。
一、case作名词的用法:
1. case有"情况、事实"之意。如:
Is it the case that you have lost all your money? 你的钱全都损失了, 是真的吗?
The police have a clear case against the prisoner. 警察有充足的事实对付那个囚犯。
case作此义时,常用于以下一些固定短语:
① in that / this case 如果那样/这样(的话);在那种/这种情况下
In that case, we'd better hold a discussion about the problem. 那样的话,我们最好对这一问题展开讨论。
He may not be back at six. In this case we won't wait for him. 他可能六点钟回不来。要是这样,我们就不等他了。
② in case of 如果, 万一,后接名词、代词或动名词。如:
Take a spare tyre along in case of need. 带只备用轮胎去,以备不时之需。
Turn off the TV set in case of thunderstorm. 在雷雨时,关上电视机。
In case of fire, dial 119 at once. 如果发生火灾,立即拨打119。
而in the case of则是"就……来说"。如:
In the case of his health, it is fortunate for him to have recovered from his illness like this. 就他的健康状况来说,能恢复到这样算是幸运的了。
Failure is no shame in the case of a scientist. 就科学家来说,失败并非羞耻事。
case的这种用法,请看2003年的高考题:
The sign reads "In case of fire, break the glass and push red button."
A. 不填;a B. 不填;the
C. the; the D. a; a
(字母下划横线的为正确答案)
③ in case 万一, 以防, 如果,引导条件状语从句。如:
In case he arrives before I get back, please ask him to wait. 万一我回来前他先到了,请叫他等我。
Please remind me of it again tomorrow in case I forget. 请你明天再提醒我一下,免得我忘记。
注意: in case引出的条件从句所表示的意义是"预防某种情况的出现";如果从句说的是一般的假设或条件,则要用if 。请比较:
I'll tell him about the matter if I meet him. (不用in case)
Take an umbrella in case it rains. (不用if )
在上下文意义很明确时,有时可省去in case后从句的内容。如:
I don't think it will rain, but I'll take an umbrella in case (it rains).
请看高考题:
I don't think I'll need any money but I'll bring some ______ .
A. at last B. in case
C. once again D. in time
④ in any case 无论如何,相当于whatever happens. 如:
You should finish your composition before school is over in any case. 无论如何,你必须在放学前完成作文。
In any case, I'll come over to the office tomorrow. 无论如何,我明天会来办公室的。
⑤ in no case决不,置于句首时,须用倒装语序。如:
In no case shall we allow smoking in the classroom. 教室里决对不允许吸烟。
In no case shall you break the rule. 你决不能违反纪律。
⑥ such being the case 既然如此,情况既然是这样
Such being the case, I have no more to say. 既然如此,我再无话可说。
Such being the case, we were very lucky to have a house of our own. 既然如此,我们能有一幢自己的房子就算很幸运了。
2. case作名词还有以下一些常见的意义:
There is a beautiful jewel case on the desk. (盒子)
This is a case of fever. (病例)
There are five cases of flu among the staff. (病人;患者)
When will the case come before the Court? (案件)
二、 case作动词,是及物动词,意为"将……装入箱子"。如:
The goods have been cased up for transport. 货物已装箱待运。
另外,be cased over with 则是"在……上另加一层物质"。如:
The copper was cased over with silver. 铜上镀着银。
The brick wall is cased over with cement. 砖墙上涂了一层水泥。