He is short,while his brother is tall.他个子矮,而他兄弟个子高-
He worked hard, however, he failed.他很努力,然而还是失败了。( however可置句首、句中或句末)
The pain was bad,still he did not complain.他痛得厉害,可是他并没有呻吟
3.表示选择关系的并列连词
表示选择关系的并列连词有:or(或),or else(否则),otherwise(要不然),either. . . or...(或,••…或……,不是……就是….. ) , rather than(而不,也不)
I must work hard,or I‘ll fail in the exam.我得认真学习,否则不能通过考试。
Either you or I am to blame.不是你就是我会受到批评
You can either do it by yourself,or you can ask someone else to do it.
你可以自己做,也可以请人做。
Seize the chance, otherwise( or else) you‘ll regret it.
抓住机会,否则你会后悔的。( otherwise, or else常接在祈使句后面)
You can either stay at home or go fishing.你可以呆在家里,或是去钓鱼:
He went rather than stay as an unwelcome guest.他走了,不愿留下来做个不受的客人。
4.表示因果关系的并列连词
表示因果关系的并列连词有:so(所以),for(因为)
It is moming,for the birds are singing.是早晨了,因为鸟叫了。
It was late, so I went home.天色已晚,因此我就回家了。
[注意]then(那么,因而),thus(因而),hence(因此),therefore(因此,所以)等副词常可放句首表示因果关系He was busy,therefore he could not come.他忙,因此不能来。
He studied hard,thus he got a full mark.他很用功,因而得了满分、
His car broke down,thus he was late for work.他的车坏了,因此他上班迟到。
It is winter now,hence the days will be shorter.现在是冬天,因此白天会短些。
(三)从属连词
用来连接主句和从句的连词叫从属连词从属连词可分为两类:引导名词性从句的从属连词和引导状语从句的从属连词
1.引导名词性从句的从属连词
引导名词性从句的从属连词有连接词that, whether和if,这些连接词在句中不充当任何句子成分;连接代词主要有who, whom, whose, which, what等,它们在句中可作主语、宾语、定语等;连接副词主要有when, where, how, why等,它们在句中可作状语(详情见名词性从句)。