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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