4、I.连词分类及作用II.常用连词用法解析一: 并列连词 1.表示平行或对等关系 。and和 ; or或者; both...and...两者都; neither...nor...既不......也不......;not only...but(also)....不但......而且...... ;as well as也 They are singing and dancing in the classroom. My father never smokes or drinks. Not only you b
5、ut also she has to clean the classroom. Jack as well as his sisters likes to play the piano. 2.表示转折关系。 but但是;however然而(其后通常加逗号);yet然而; while然而; while而,常用来表示前后鲜明的对比 She hasn't got a puter, but her brother has. It will be sunny but cold. Some people love
6、pets, while others hate them. These apples don't look nice, yet lots of people buy them. 3.表示选择关系。 or或者;否则 not...but...不是......而是......; either...or...或者......或者......连接两个主语时,谓语动词应当与or后面的主语在人称和数上保持一致。 在并列的否定句中,用or代替and构成完全否定,如果所连接的两部分都有否定词,用and而不用or
7、连接。 Don't ride so fast or you'll get hurt. Either he or I am going to the movie. 4.表示因果关系。for因为 so因此,所以 The days are short, for it is November now. I felt very tired so I went to bed early.二:从属连词 1.引导宾语从句的从属连词。主要有that(无词义,可省略),if和whether。whether可与or not连
8、用,在句中不作成分,在ask,wonder,not know, want to know,not be sure等后常用whether或if从句,而不用that从句。 The foreigner asked me if I could speak English. 2.引导时间状语从句的从属连词。主要有when,while,as,after,before,until/till,since,as soon as等。