it may rain ,___the hike will be cancelled.

在in that case中，that是指示代词，因此，in that case在句子中不能起引导从句的作用；而in which case中which是关系代词，因此它引导定语从
句；
in that case
1. 如果那样
2. 假如那样的话
3. 如果那样的话
4. 如果是那样的话

if in that case
1. 假如那样的话

d in that case
1. 如果那样的话

in that case: if so
1. 如果那样，在那种情况下

in that case, he would be punished
1. 要是情况如此，他将会受到惩罚

in which case
1. 而在这样情况下

in which case (relative)
1. 在这种情况下

he may come,in which case i'll ask him
1. 他也许会来，来了我就问他

she may be late, in which case we ought to wait for her
1. 她可能晚到，那样我们就要等等她

whether it is a case in which criminal responsibility should not be investigated
1. （三）是否属于不应追究刑事责任的

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 th