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在It is strange that...句式中，其中由that引导的主语从句可以陈述语气，也可以用虚拟语气，其区别是：用虚拟语气（should+动词原形）主要强调惊讶之意，其感情色彩比较浓；若不特别强调感情色彩，则用陈述语气。 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。 | 
