Unless,besides,except的区别
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Unless/except/except for/besides区别
不要混淆unless,except,except for 和besides。unless用于引出某事发生或成立所必需的条件,如:In the 1940s, unless she wore gloves a woman was not properly dressed(在20世纪40年代,女性若不戴手套就算衣着不得体),You must not give compliments unless you mean them(除非出自真心,否则不要随便恭维)。谈论由于某事未发生而导致的情形不能用unless,要用if...not,如:I'll be glad if she doesn't come(如果她不来我会很高兴的)。except 用于引出陈述中唯一不适用的事物、情形、人或想法,如:All of his body relaxed except his right hand(除了右手以外,他全身都放松了),Travelling was impossible, except in the cool of the morning (除了在凉爽的早晨,其他时候出行都是不可能的)。except for 用于引出使其陈述不能完全成立的事物,如:The classrooms were silent, except for the scratching of pens on paper(除了笔在纸上发出的沙沙声,教室一片寂静),I had
absolutely no friends except for Tom(除了汤姆,我一个朋友也没有)。besides用于引出已提到事物之外的其他事物,如:Fruit will give you, besides enjoyment, a source of vitamins(水果不但好吃,而且富含维生素)。但应注意,用于谈论除某人或某物之外唯一的人或物时,besides的意思与apart from 相同,如:He was the only person besides Gertrude who talked to Guy(除格特鲁德之外,他是唯一跟盖伊说话的人)。