[观察例句]
1．He encouraged me to be a writer in the future.
2．In the past few years，Lucy has formed the habit of keeping a supply of candles in case of a power failure.
3．It is natural that young people are often uncomfortable when they are with their parents.
4．Today's experience taught me some valuable lessons in my life.
5．I love children very much because I always feel that they bring great happiness and excitement to my life.
[归纳用法]
(一)前缀
1．表示否定意义的前缀
(1)un
unfortunate 不幸的
unable 不能够的
uncomfortable 不舒服的
(2)in
inconvenient 不方便的
incorrect 不正确的
informal 不正式的
(3)im
impolite 不礼貌的
imperfect 不完美的
impossible 不可能的
(4)il
illegal 违法的
illogical 不合逻辑的
(5)ir
irregular 不规则的
irrelevant 不相关的
(6)non
nonviolent 非暴力的
nonprofit 非盈利的
(7)dis
dislike 不喜欢
disapprove 不赞成
dishonest 不诚实的
disadvantage 弊端，不利条件
