1.distinctive和distinct

　　distinctive“有特色的”，“独特的”;

　　distinct“清楚的，明显的”;a distinct smell of alcohol on his breath; the distinctive stripes of the zebra.

　　2.dual和duel

　　dual“二重的”;dual personality双重人格;dual control双重管辖;

　　duel“决斗，竞争”;fight a duel with sb.与某人决斗;challenge sb. to a duel向某人提出决斗;a duel of wits斗智

　　3.eatable和edible

　　eatable a.“可食用的，可吃的”;n.“食物、食品”。

　　edible a.“适合食用的，可以吃的”;n.“食品”。

　　在指吃的时候二者可通用：The toast was burnt and barely eatable/edible.但在其他情况下不一样。

　　If something is eatable, it may be eaten (though it may not be safe or desirable to do so); but, if something is edible it is safe to eat.

　　4.economical和economic

　　economic“经济学的，经济上的”an economic survey of Scotland

　　苏格兰经济调查;an economic blockade经济封锁;economical“节俭的，经济的”;He's had to learn to be more economical now that his only income is a small pension.

　　5.evoke和invoke

　　evoke“唤起，引起”;evoke admiration引起羡慕。

　　invoke“祈求(神灵)保佑，乞灵于”，行使(法权);The shaman invokes the spirits of their ancestors. If our case fails in the national courts we will invoke the European Declaration on Human Rights.

　　6.fatal和fateful

　　fatal” causing death or disaster”“致命的”; a fatal disease不治之症;a fatal wound致命伤。

　　fateful” crucial, significant, deciding one's fate”“重大的”，“决定性的，决定命运的”; On that one fateful day in October, millions of pounds were wiped off the value of shares.

　　7.fictional和fictitious

　　fictional“虚构的，小说的”。

　　fictitious“虚构的，编造的”(denotes something that is not real and has been created with the intention of deceiving others);He gave the police a fictitious name.

　　8.historical和historic

　　historical“有关历史的”，“历史的”, the historical period历史阶段;historical personage历史人物。

　　historic“历史上有名的，有历史意义的”, historic town历史名城。

　　9.impassable和impassible impassable“不能通行的”，“不可逾越的”;an impassable swam不能通行的沼泽地。

　　impassible“不感疼痛的;无动于衷的”; an impassible God无动于衷的神。

　　10.infer和imply

　　infer“猜想，臆测”，“推断”;infer a motive from an effect从效果推知动机。

　　imply“含有……的意思”; Do you realize what his words imply?你领会他说话的含意吗? I do not imply that you are wrong.我的意思不是说你错了。