It ＋be动词+谓语＋strange+that从句。It 作形式主语，以that 引导的名词性从句是真正的主语。后面可用陈述语气，也可用虚拟语气（should+动词原形或动词原形）。
如：
It is strange that his dog can sense danger.
他的狗能感觉到危险，真是不可思议。
It is strange that you haven't heard the news.
奇怪的是你没有听说这个消息。
It is strange that you don't know him.
令人不可思议的是你居然不认识他。
It is strange that nobody knows where he lives.
真奇怪，谁也不知道他住在哪里。
It is strange that nobody should know where he lives.
居然没有人知道他住在哪里，真奇怪。
It is strange that he get a degree in such a short time.
不可思议的是他居然在这么短的时间拿到了学位。
It is strange that he ( should) have so many friends.
太奇怪了，他有那么多的朋友。
It is strange that he should have made such a mistake.
他居然犯了这样一个错误，真奇怪。
It is strange that we should meet here.
我们会在这里相遇，真是不可思议。
It is strange that he should have never been to Beijing.
很奇怪，他从来没去过北京。
It’s strange that there are no lights on.
真奇怪，没有一盏灯是开着的。
It’s strange that there should be no lights on.
真奇怪，竟然没有一盏灯是开着的。
It’s strange that he has left without telling us.
奇怪，他没有和我们说一声就走了。
It’s strange that he should have left without telling us.
奇怪，他竟然没有和我们说一声就走了。
与本句型相似的还有以下句型：
1. it is natural that…句型：
It’s natural that you should forget it. 你忘了这事不足为奇。
It is quite natural that he should think so. 他这样想是很自然的事。
2. it is amazing that…句型：
It is amazing that they’re still together. 他们还在一起，真是让人感到惊讶。
It is amazing that they should still be together. 他们竟然还在一起，真是让人感到惊讶。
3. it is astonishing that…句型：
It’s astonishing that she says that sort of thing to you. 她对你说出那种话，真叫人吃惊。
It’s astonishing that she should say that sort of thing to you. 她居然对你说出那种话，真叫人吃惊。
4. it is surprising that…句型：
It is surprising that she has married a farmer.
她和农民结婚实在令人意想不到。
It is surprising that she should have married a farmer.
她居然和农民结婚实在令人意想不到。