surprised作表语时含被动意义，主语一般是人，后接由介词at引导的短语、动词不定式或that。surprised后接介词at表示对…感到惊讶，后接介词from表示出其不意使…说了，后接介词。

例句：She looked surprised when I told her.我告诉她时她显得很惊讶。I'm surprised at you, behaving like that in front of the kids.我真想不到，当着孩子们的面你竟做出这种举动。You shouldn't be surprised (that) he didn't come.他没来，你不必感到意外。