初四连词.docVIP

连词 and“和”? 连接两个并列成分,连接谓语时,两个动词时态应一致。 but “但是” 表转折，不能与 though 同时出现在句中。 or “或者”在否定句中，并列句中的列举常用 or，而不用 and。 Eg: I have brothers and sisters. 其否定句为： I dont have brothers or sisters. = I have no brothers and no sisters. both…and 既~又~谓语用复数动词 neither…nor 既不~也不~含否定意义，（就近原则）谓语动词由靠近它的那个主语来决定单复数。 either…or… ? “或者 …或者…”“不是…就是…” 从属连词 1．? 引导宾语从句的连词 陈述句：that 可省略 一般疑问句：if /whether “是否” 特殊疑问句：特殊疑问词 2．? 引导原因状从的有： because (不能与so同时出现在句中) 3．? 引导时间状语从句的连词： A.????? when（当…时候），as soon as…（一…就），not…until（直到…才），after（在…之后），引导的主从复合句，主句为一般将来时，从句则用一般现在时来代替一般将来时。Eg: I wont leave until he comes back. B.????? since（自从…以来）引导的主从复合句，主句为现在完成时，从句用一般过去时。Eg：We havent met each other since she left here last year. C.????? while（当…时候，一边…一边…）它引导的时间状语从句常用进行时态。Eg: My father came in while I was doing my homework. 4．? 引导条件状语从句的连词： if ? “如果”，引导条件状从，主句用一般将来时，从句则用一般现在时。请区别于if“是否”相当于 whether，引导宾语从句，时态根据语境确定。eg:1)I dont know if it ＿＿＿＿ (rain) tomorrow. 2)If it ______ (rain) tomorrow, I _____________ (not climb) the hills. 3)Joan and Mary havent seen each other_____they left school five years ago.???? A.as?? B.before?? C.after?? D.since 5．? ? ? Practise 1.?????? Study harder, ___ you’ll certainly catch up with others. A. and or yet while 2.?????? Get up early tomorrow, ___ you’ll miss the first bus. A. and so or but 3.?????? To learn English well is not easy, ___ it is necessary for us. A. and so or but 4.?????? Mary is only five years old, ___ she can read and write. A. of so for but 5.?????? Lily asked ___ I came from Japan and I said that’s right. A. when why how if 6.?????? She asked them ___ they could swim. A. if that what how 7.?????? You’d better study English well ___ it is widely used in the world. A. but because so until 8.?????? Last Sunday I went to see my grandma ___ she was ill. A. because if though until 9.?????? ___ it is raining, let’s stay at home. A. Since Because As So 10.?? They were watching TV ___ someone knocked