2. 你知道形容词的否定前缀有哪些吗？

impolite
impatient
improper|不可能的
不礼貌的
①
不合适的|It's impossible to finish the work in an hour.
Talking loudly in the library is impolite.
He gets impatient when waiting for others.
Wearing jeans to a wedding is improper.|
|in-|incorrect
invisible
inactive
independent|不正确的
看不见的
不活跃的
独立的|Your answer to the maths problem is incorrect.
Bacteria are invisible to the naked eye.
She has been inactive since she hurt her leg.
Children should learn to be independent from a young age.|
|un-|unhealthy
unhappy
unusual
②|不开心的
不健康的
不寻常的
不舒服的|She looks unhappy today-did something happen?
Eating too much junk food is unhealthy.
It's unusual to see snow in this city in April.
The hard chair made me feel uncomfortable.|
【即学即练】写出下列形容词的反义词。
原词: safe, formal, friendly, interesting, tidy, perfect, important, common

反义词:
Keys

①不耐烦的（或没有耐心的）；②uncomfortable
即学即练反义词：unsafe, informal, unfriendly, uninteresting, untidy, imperfect, unimportant, uncommon

1. 表格填空：①结合例词impatient和例句“He gets impatient when waiting for others.”，可知该词含义为“不耐烦的/没有耐心的”；②根据含义“不舒服的”和un-否定前缀，对应的例词是uncomfortable。
2. 即学即练部分，根据八年级下册所学的形容词否定前缀（un-、in-、im-等），给原词添加合适的否定前缀构成反义词：safe加un-变为unsafe；formal加in-变为informal；friendly加un-变为unfriendly；interesting加un-变为uninteresting；tidy加un-变为untidy；perfect加im-变为imperfect；important加un-变为unimportant；common加un-变为uncommon。