it is strange that

从句用虚拟语气（should）do

It is strange that you should not know it.
你居然不知道那件事，真奇怪。
It is strange that he says so.
他这样说真奇怪。
It is strange that he has not returned.
奇怪，他还没回来。
It is strange that he should feel so angry.
真奇怪，他会这么生气。
It is very strange that there is owls inside the room.
房间里有猫头鹰是很奇怪的。

strange.奇怪的
It是形式主语。that后的从句是意义上的主语，这个从句表达的东西是奇怪的。
It is strange that I lost my purse.

奇怪的事情是 I lost my purse.

it is strange that+从句 表示对从句的内容感到非常疑惑
例句：
It is strange that nobody knows where he lives .
真奇怪，谁也不知道他住在哪里。