2.在It's surprising/ strange/ a pity...以及I'm surprised/ sorry...等句型中,當"竟然會"講.例如：
①It's surprising that you should be so foolish.真令人吃驚,你竟會如此愚蠢!(現在)
②It's surprising that you should have failed to pass such an exam.真令人吃驚,這樣的考試你竟然不及格.(已發生)
3.單獨用"should (not) +have+過去分詞"形式,對已發生的事表示遺憾或責備,表達"本該或不該"之意.例如：
①He also learns that he should have cared more about his friends.他還明白了他本應該多關心朋友.(高一課本上冊P4)
②He shouldn't have let out the secret.他本不該泄露秘密的.(實際情況是"他已泄密".)
二、用于揣測,表示可能或期望,意思是"照理說來、應該".
在語氣上should比must弱,但比may/ might強；shouldn't比
can't弱,但強于may/ might not.例如：
①I should be home in about ten minutes.照理說來,約十分鐘后我就能到家.(高一課本上冊P59)
②He should be having class now.他現在應該是在上課.
③As far as I know you shouldn't have any problems there.就我所知,在那里你不會遇到任何問題.
④According to the schedule,they should have arrived in Shanghai by now/ yesterday.按照計劃,他們現在/昨天應該已經到達上海了吧.
(注：本句中的"should+have done"結構并不表示責備,僅表示說話人的揣測.)