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1、第三课时第三课时Section A(Grammar Focus3c)单元同步语法精讲含有if引导的条件状语从句的主从复合句由一个主句和一个或一个以上的从句构成的句子叫复合句。若由连接词引导的句子在复合句中表示条件，作主句的条件状语，则该句子被称为条件状语从句。1条件状语从句的引导词。条件状语从句通常由连词if(如果，假如)，unless(ifnot，除非，如果不)引导。eg：You will get good grades，if you study hard.如果你努力学习，就会取得好成绩。If you dont leave right away，you will be late.如果你不马上
2、来，你将会迟到的。2条件状语从句的位置。条件状语从句既可以放在主句之前，也可以放在主句之后。如果放在主句之前，要用逗号与主句隔开；如果放在主句之后，中间不必用逗号。eg：If it doesnt rain tomorrow，we will go shopping.如果明天不下雨，我们将去购物。You can pass the exam if you study hard.如果你努力学习，你就会通过考试。3条件状语从句的时态。若主句为将来时态或是含有情态动词的句子或祈使句，则条件状语从句用一般现在时。eg：He will not leave if it isnt fine tomorrow.如果
3、明天天气不好，他就不会走。(主句用一般将来时，从句用一般现在时)If he comes，let me know.如果他来，让我知道。(主句是祈使句，从句用一般现在时)单元同步语法强化训练一、用括号中所给单词的适当形式填空。1You _(look) younger if you _(wear) this new dress.2If we _(get) up late，we _(have) no time for breakfast.3If there _(be) a fire，I _(call) 119 for help.4Susan _ (come) if you _(have) a birt
4、hday party.5If I _(be) free tomorrow，I _(visit) my aunt.will lookweargetwill haveiswill callwill comehaveamwill visit二、单项选择。6If she _ a car，she will drive to work every day.Abuys BboughtCwill buy Dis buying7We _ swimming together if he comes this afternoon.AgoBwentCgoingDwill go8What _ if the teache
5、r knows the facts tomorrow?I dont know.Ahappens BhappenedCwill happen DhappeningC AD9If you take part in the game，you _ a good time.Ahave Bwill haveChaving Dhad10I will give him the book if I _ him next week.Ameet BmetCmeeting Dwill meet11Aunt Lucy will tell us something about her trip to Australia
6、when she_back.(2014，重庆)Acomes BcameCwould come Dwill comeBAA三、根据汉语完成句子。12如果你感觉累，就打电话叫我来替换你。_，please call me to take your place.13如果我吃太多食物，我会变胖的。If I eat too much food，_.14如果我们跑得快，就能赶上最后一班公交车。If we run fast，_.15如果她问你，你会告诉她答案吗？Will you tell her the answer _?16如果他一个人独自生活，他将养一只狗。If he lives alone, _.If
7、you feel tiredI will get fatwe will catch the last busif she asks youhe will keep a dog1upset 形容词，意为“心烦的；沮丧的”。eg：He was upset after the exam.考试后他很失望。2advice 是不可数名词，意为“建议；劝告”，若表示一条或几条建议或劝告，要借用piece。eg：some advice一些建议two pieces of advice两条建议单项选择。1He felt _after his father died.AangryBupsetCcareless2I have some problems with my English writing. Can you give me some_？Aadvice Bdecisions Cinformation3He often goes home by _after 11：30 pm. There are no buses.Afeet Bbuses CtaxiBAC
