in case of 是什么意思？in case +that和just in case有什么区别？

1. in case of+【名词/名词性短语】：以防XX. 例如：I told them what to do in case of an emergency. 我告诉了他们在紧急情况下要做什么。 2. in case that+【从句】：以防XX. 相当于第一个in case of后面需要接句子了，就不能用of了，就改用that去连接这个句子。例如：I told them what to do in case that the elevator didn't work.我告诉了他们如果电梯坏掉应该怎么办。 3. Just in case.以防万一。 后面不接什么，算是个完整的句子了。例如：We backup this file before we make any changes to it, just in case.我们在对这份文件更改前都会备份下，以防万一。