case后接定语从句用什么关系词

假若先行词是case，case后面接的定语从句用什么关系词来引导？是用that, when还是where？请老师各举几个例句，谢谢！

具体使用方法请参照stage。仅此提供有关case的例句，请注意case在定语从句中的成分。
Let us imagine a hypothetical case where we disagree. 让大家假设一个大家不认可的情况。
It is in the former case where a systematic method is important. 在前一种状况中有规则的办法是尤为重要的。
We cannot help you in a case that lies outside our jurisdiction. 大家对权限以外的事情帮不了你忙。
Break out any sub use case that needs its own space. 把需要自己独力出来的东西分开变成子用案例。
This is the case which we often deal with. 这是大家常常处置的状况。