therefore的两种用法

发布时间：2020-07-01 20:00:40 来源：文档文库

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Therefore的两种用法

一、整句中时一般不放句末，句首后要有逗号句中1、按一般副词使用2、做插入语这两个分得清吧 eg.1、Therefore we must learn English well. 2、They therefore can learn English well. 3、Many fast food restaurant ,therefore,have red furniture or walls.

二、用在分句中即一个句子一部分表示原因一部分表示结果。这时一般词前要用分号其后用不用逗号无所谓。若第二个分句前是逗号或无符号则要注意therefore是副词和so不一样要保持句子完整应用and therefore。 eg.1、I had a headache;therefore I could not go to your party. 2、I was ill,and therefore could not come. 3、These birds are very beautiful and therefore liked by many people. However的用发 1. 用作副词 (1) 表示让步意为“无论如何”“不管怎样” 用来修饰形容词或副词其词序为 however+形容词或副词+主语+谓语。这样用的however其实具有连词的功能用以引导让步状语从句。如 however much he eats, he never gets fat. 不管他吃多少他永远吃不胖。用于此用法时请注意以下几点 ①此用法属however所有用法中最重要的考点同学们务请引起高度重视。 ②这样用的 however 与 no matter how 大致同义。如People always want more, however [no matter how] rich they are. 人总是富了还想再富。 however [No matter how] hard I worked, she was never satisfied. 无论我多么努力地工作她从来没满意过。 ③有时从句谓语可用情态动词。如 Don’t laugh, however funny it may be. 无论多么有趣也不要笑。 I’ll try to finish it in time, however hard it may be. 无论多么难我也要按时完成。 ④“however 形容词或副词主语谓语”有时可以有所省略。如 I refuse, however favorable the conditions. 不管条件如何有利我都不干。(conditions后省去了are) I’d rather have a room of my own, however small (it is), than share a room. 无论房间多么小我宁愿一个人住一间而不愿意与别人合住一个房间。 A grammar rule, however true (it is), is useless unless it can be understood. 一条语法规则不管如何正确除非能懂否则毫无用处。 (2) 表示转折尤其用于谈及一个既成事实时表示转折其意为“可是”“仍然”等。可放在句首、句中或句末通常用逗号与句子其他成分隔开。如 My father, however, did not agree. 但是我父亲不同意。 My room is small; however, it’s comfortable. 我的房间很小但却很舒服。 He said that it was so; he was mistaken, however. 他说情况如此可是他错了。表示惊奇或强调相当于how ever的用法其意为“究竟怎样到底以什么方式”。如 however did you get here without a car? 没有汽车你究竟是怎样来的呢? But的用法 but是转折带有非常浅的转折和递进义在里面以至于几乎可以省略或者使用while替代首句描述母亲动作次句是人物的状态首句正常描述次句揭示问题引出下文。