Unit4　CyberspacePeriodThree　Grammar课件（北师大版必修2）.ppt

Period Three　Grammar;1．will will除了具有“将要”“愿意” 等基本含义外，还可表示推测、猜测、推论、估计等，表示依据直觉、知识、经验等做出的揣测，也可表示根据自然规律必然会发生。 ; Theres a ring at the door.That will be the postman，I suppose.门铃响了，我想可能是邮差来了。 It will be snowing now in London. 现在伦敦大概在下雪吧。 Oil and water will not mix.油和水不相溶。;2．be going to be going to除了具有“将要”“ 准备”“ 打算”等基本含义外，还可表示预计要发生、不可避免会发生之意，而且这种预计或推断是根据目前观察到的某种迹象、证据作出的。 英国语言学家R.Quirk将be going to的这种含义称为“现在原因的将来结果(future result of present cause)”。 Youre going to have trouble with that car before long. 这辆车很快就会给你带来麻烦的。;Im going to be fifty next month. 下个月我就50岁了。 Shes going to have a baby.她要生孩子了。 I mean to go，and nothing is going to stop me. 我想走，什么也阻止不了我。 It looks as if hes going to win the game. 他似乎快要赢得比赛了。 Look at these dark clouds—theres going to be a storm. 看看那些乌云，暴风雨快来了。; 条件句 包含条件状语从句的句子通常称为条件句。条件句有两类，一类是真实条件句，一类是非真实条件句。 1．真实条件句 有些条件句表示可能成为现实的情况，被称为真实条件句。真实条件句的构成和用法如下：;(1)由“if引导的条件状语从句(一般现在时)＋主句(陈述句一般将来时)”构成，表示假设的情况有可能发生。 If the rain stops，the match will begin. 如果雨停了，就要开始比赛。 If you go to the Science Museum，you will see a lot of interesting exhibitions. 如果去科技博物馆，你就会看到很多有趣的展览。 If people dont stop polluting the air，animals and plants will soon die. 如果空气污染得不到控制，动植物不久将灭亡。;(2)由“if引导的条件状语从句(一般现在时)＋主句(祈使句)”构成，常用来表达建议、请求、命令等。 If you feel sleepy，go to bed. 如果你困了，就上床睡吧。 If you want an interesting day out，visit the Science Museum. 如果你想度过有趣的一天，就去参观科技博物馆。 If she comes，phone me. 如果她来了，给我打个电话。;2．非真实条件句(虚拟条件句) 有些条件句表示不大可能实现的或与事实相反的情况，被称为非真实条件句。非真实条件句的用法和谓语形式如下表： ;If I were you，I would invite him to the party. 如果我是你，我会邀请他参加聚会。 If I didnt do exercise every day，I wouldnt be so strong. 如果不是每天锻炼，我身体不会那么结实的。 If we should fail in this matter，we would be ruined. 如果这件事失败，我们就毁了。 If I asked him，hed help us. 如果向他提出请求，他会帮我们。; I would have arrived much earlier if I had not been caught in the traffic. 如果没有堵车，我会早一点儿到达。 If I had met Li Hua，I could have told him. 如果我碰见了李华，我就告诉他了。 If they had invited her，she would have attended it. 如果他们邀请她，她就会参加了。;语法专练 1．If my car________more reliable，I would have driven to L