前缀im 　　possible-impossible 　　patient–impatient 　　precise–Imprecise 　　前缀un 　　successful–unsuccessful 　　reliable–unreliable 　　shaven–unshaven 　　important–unimportant 　　predictable–unpredictable 　　comfortable-uncomfortable 　　fortunate-unfortunate 　　暂时想到和找到这么多 　　淡定