Unit5 Amazing things重要知识点梳理：1. They turned around but saw nothing.她们转过身去，可什么也没看到。turn around转身Jim turned around and saw his parents standing behind him.吉姆转过身去，发现他的父母在他的身后。nothing表否定意义的不定代词，意为“没什么”Nothing is difficult for you, if you try your best.（作主语）I have nothing, so I dont want to go with you. 我一无所有，因此我不想与你一起去。（作宾语）He can find nothing wrong in your composition. 他在你的作文中找不出任何错误。（形容词wrong修饰不定代词nothing时置于其后）2. frightened与afraid的区别frightened可用作表语，也可用作定语。用作定语时，意为“受惊的”。
