1、八年级英语下册Unit 6 语法讲解与练习一、讲解unless, as soon as和sothat1.unless是连词，意为“如果不”、“除非”。连接一个条件状语从句，等于ifnot，不同点在于：ifnot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 doesnt 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。Ill write to you as soon as I get th
2、ere.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.sothat“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，sothat可以与been
3、ough to do转换；当从句为否定句时，可以与tooto或be notenough to do转换。The boy is so young that he cant 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 couldnt help _ when we heard the funny story.A laugh B laughing C la
4、ughs D to laugh（ ）2.Jack,you look tired today.Whats wrong?I was _ busy_ I didnt go to bed until midnight yesterday.A.such;that B.too;to C.so;that D.enough;to（ ）3.Lets 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
5、 _ I got home.A. so that B. as soon asC. until D. though( )5.You cant get good grades _ you study hard than beforeA.if B.when C.unless D.so( )6.The boy is _ young _ he cant go to school.A.as;as B.too;toC.so;to D.so;that( ) 7.Youll get fatter _ you exercise every day.A.unless B.if C.so D.when( )8.The
6、 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/suchthat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
7、.4.It was _ an interesting story _ everyone fell in love with it.5 I wont 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 cant walk farther.2.除非下雨，否则他们将不会呆在家。_ it rains,they wont _ _ 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 sit you _ _ _ I _ there.5.他跑得太快，我追不上他。He ran _ fast _ I couldnt catch him.【答案】2一、1-8. BCCBC DAD二、1. so that2. if3. as soon as4. such that5. unless三、1. so weak that2. Unless stay at3. as soon as wakes up4. as soon as get/ arrive5. so that
