合成由两个或多个词合成一个单词。 news paper newspaper pick pocket pickpocket table cloth tablecloth get together get-together play ground playground reading room reading-room green house green-house blue eye blue-eyed 转化一个单词由一种词类转化成另一种词类而词形不变，但它本身有几种词性。 Idreameda terribledream. To oursurprise she began to sing. The newssurprise all of us. Yesterday I wenthome.Then I went to my teather'shome. 派生派生词由词根加上前缀或后缀构成。 反义词前缀：dis-，non-,un-,in-,ir(r)-,im-(m或p)，il-+（l）anti-,mis-, like dislike possible impossible stop nonstop regular irregular certain uncertain legal illegal justice injustice fascist antifacist understand misunderstand 其他常见前缀：inter-，re-, national international tell retell 形容词后缀：-ly，-ful，-y，-less, day daily friend friendly harm harmful health healthy care careless 副词后缀：-ly near nearly 名词后缀：-er，-ist,-sion,-ness,-ment teach teacher tour tourist discuss discussion ill illness move movement 动词后缀：-ize,-en real realize deep deepen |
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