八年级英语下册 Unit 6 语法讲解与练习 一、讲解 unless, as soon as和so…that 1.unless是连词，意为“如果不”、“除非”。连接一个条件状语从句，等于if…not，不同点在于：if…not是口语，unless为书面语，有否定意思。 I shall go there unless it rains.=I shall go there if it doesn’t rain.我去，除非下雨（如果不下雨， 我就去）。 2.as soon as一……就……，用来引导时间状语从句。在句子中的位置比较灵活，而且可以用于各种时态。 I’ll write to you as soon as I get there.我一到那儿就给你来信。 As soon as I got the news, I came to tell you.我一得到消息就来告诉你。 若主句用一般将来时，unless引导的条件状语从句和as soon as引导的时间状语从句多用一般现在时代替一般将来时。即“主将从现”。 3.so…that…“如此……以至……”引导结果状语从句。 When the football fans saw Beckham, they got so excited that they cried out.当球迷们看到贝克汉姆的时候，他们如此激动以至大喊大叫。 当that引导的结果状语从句为肯定句时，so…that…可以与be…enough to do转换；当从句为否定句时，可以与too…to…或be not…enough to do转换。 The boy is so young that he can?t look after himself. =The boy is too young to look after himself. =The boy is not old enough to look after himself. 这个男孩太小而不能照顾他自己。 二、练习 一、单项选择。 （ ）1. We couldn’t help _____ when we heard the funny story. A laugh B laughing C laughs D to laugh （ ）2.—Jack,you look tired today.What’s wrong —I was _____ busy_____ I didn’t go to bed until midnight yesterday. A.such;that B.too;to C.so;that D.enough;to （ ）3.—Let’s go hiking _____ staying at home,shall we —Good idea. A.as well as B.in order to C.instead of D.instead ( ) 4.My mother gave me a cup of milk _____ I got home. A. so that B. as soon as C. until D. though ( )5.You can't get good grades _____ you study hard than before A.if B.when C.unless D.so ( )6.The boy is _____ young _____ he can't go to school. A.as;as B.too;to C.so;to D.so;that ( ) 7.You'll get fatter _____ you exercise every day. A.unless B.if C.so D.when ( )8.The little boy fell asleep _____ he got on the bus. A.until B.if C.while D.as soon as 二、用连词if,unless,as soon as或so/such…that填空。 1.The animals were _____ lovely _____ I spent a whole day in the zoo. 2._____ it is cold tomorrow,he will stay at home and watch TV. 3.I sent some flowers to her _____ she finished speaking on thestage. 4.It was _____ an interesting story _____ everyone fell in love with it. 5 I won't let you in _____ you show me your pass. 三、根据汉语意思完成句子，每空一词。 1.他妹妹身体太弱了，不能再走了。 His sister is _____ _____ _____ she can't walk farther. 2.除非下雨，否则他们将不会呆在家。 _____ it rains,they won't _____ _____ home. 3那个婴儿一醒来就哭。 That baby will cry _____ _____ _____ he wakesup. 4.我一到那儿就去拜访你。 I will ⅵsit you _____ _____ _____ I _____ there. 5.他跑得太快，我追不上他。 He ran _____ fast _____ I couldn't catch him. 【答案】 一、 1-8. BCCBC DAD 二、 1. so that 2. if 3. as soon as 4. such that 5. unless 三、 1. so weak that 2. Unless stay at 3. as soon as wakes up 4. as soon as get/ ... ...
~~ 您好，已阅读到文档的结尾了 ~~
