in case in case后面一定要加情态动词吗?in case可以用在什么从句中,分别举例说明?in case 有

in case
in case后面一定要加情态动词吗?in case可以用在什么从句中,分别举例说明?in case 有虚拟的意思吗?

in case后面不一定要加情态动词的,同时它也有虚拟的意思.这两点你可以参看下面的例子.
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
in this case:在这个场合
in that case:（短语）若是那样的话 例：YOU don't like this place?In that case,why don't you leave?
In case of 和for fear of的用法区别
1.作“提防”,“惟恐”这个意思讲,in case of 和for fear of 是同义词,但不一定能通用：in case of 只能用来引导名词,for fear of 多半引导动名词短语.
例如：In case of fire,break the bottle.如果发生火灾,请把瓶打破.
I always put some money in my pocket in case of need.我总是要在口袋里放一点钱以备需用.
2.短语in case 是个连接语,作“假如”、“万一”讲.
例如：And now Hercules began to consider what he should do,in case Atlas should be drowned in the sea.
You’d better take an umbrella with you in case it rains.
3.同if不一样,用作连词引导条件句时,in case这个短语通常用于陈述句,不用虚拟语气,而且意思也不一样.
例如：
In case I ask for leave,will she agree?如果我请假,她会答应吗?
If I were to ask for leave,would he agree?如果我请假,他会答应吗?
4.即使主句是将来时态,由in case 引导的从句,仍然使用现在时态.
例如：
In case the weather is fine tomorrow,we shall hold a meeting.如果明天天气好的话,我们将召开一次会议.
Henry will resign in case you drive him too hard.如果你欺人太甚的话,亨利就会辞职不干.
5.作“以防”来讲,in case相当于for fear that,并可以通用.
例如：I wrote it down in case/ for fear that I should forget it.我已把它抄下了,免得忘记.
I must stay at home this morning in case/for fear that he comes to see me.我今天上午必须呆在家里,恐怕他会来看我.
6.In case这个短语,英美英语中的意思有时候并不相同.
例如：I will come in case I am wanted.我会来的,因为也许有人要找我.（英式英语）
I will come in case I am wanted.我会来的,只要有人找我.（美式英语）