英语里什么是前缀，后缀？什么是词根，词尾？急~~~~~~~~~

前缀就是放在单词前面的 改变这个词的词义
例如A．表示否定的前缀
1．dis－加在名词、形容词，动词之前
disadvantage dishonorable disagree
2．in-加在形容词，名词之前
incorrect inability inaccurate
3．im-加在字母m,b,p之前
impossible impolite
4．il-加在以1开头的词前
illegal illiterate illogical
5．ir-加在以r开头的词前
irregular irresistible irresolvable
6．un-加在名词，形容词，副词之前
unfinished undoubted unemployment
7．non-加在形容词，名词前
nonexistence nonessential non-electrical
8．mis－加在动词、名词之前
misunderstand misjudge misleading misfortune
9．dis-加地动词之前
disappear disarm disconnect
10.de-加在名词，形容词之前
demobilize decolor
11.anti-加在名词、形容词之前
anti-Japanese anti-social
12.counter-加在名词、动词前
counterattack counteract counterrevolution

B.表示“前before”的前缀
1. pre-
preconception preexisting preface
2．ante-
anteroom antecessor
3．fore-
forehead foreground foreman foresee foretell