条件状语从句完整市公开课获奖课件

1、grammarConditional clauses第1页第1页条件状语从句 引导条件状语从句最惯用连词是if，常见if条件状语从句表示在某条件下，某事很也许发生 If you ask him，he will help you假如你请他帮忙，他会帮你。 If you fail in the exam，you will let him down假如你考试不及格，你会让他失望。 第2页第2页假如你作业做完了就能够回家了。 If you have finished the homework， you can go home.第3页第3页If 从句 （普通现在时）， 主句 （ 普通现在时 ）表示科学常

2、识，阐明， 经常性动作，倾向 自动会发生事 1. If water is heated, it turns to steam. 2. If people dont get enough sleep, their thinking ability is reduced .3. If I need a haircut, I usually go to the barbers near where I live.4. People often dont go out on Sundays if it rains.第4页第4页2表示未来也许性，能力， 允诺，命令，要求，请求，提议时，利用“主将从现”原

3、则。1. If I get the job, Ill buy a mobile phone.2. If my homework is difficult, Ill ask Helen to help me.3. If I have time this afternoon, Ill go to the barbers to get a haircut.第5页第5页那么，除了if之外，是否尚有其它连词能够引导条件状语从句呢 回答是必定。不但有，尚有诸多。这些词由于出现频率小，且使用办法较复杂一些，因此不如if为大家所熟知罢了。下面就这些词使用办法做一简介。 第6页第6页1unless 除非；若不；

4、假如不；除非在时候 1. You will fail to arrive there in time unless you start earlier假如你不早点动身，你就不能及时赶到那儿。 2. Unless bad weather stops me，I go for a walk every morning除非天气不好，我天天早晨都要去散步。 3. I wont loan you unless you are in extreme need of money若不是你急需用钱，我不会借钱给你。 第7页第7页2on condition that只有在条件下，以为条件 on condition

5、that引导条件从句是主句中事件发生前提条件或唯一条件。 I can tell you the truth on condition that you promise to keep a secret我能够告诉你真相，条件是你答应保守秘密。 You can pass the custom on condition that we have checked your luggage你能够通过海关，但条件是我们得检查完你行李。 第8页第8页3supposing ( that) conj假若，倘若 supposing 引导从句表示一个假设条件。通常在句首 Supposing it rains，sha

6、ll we continue the sports meeting？倘若下雨，我们运动会还会继续进行吗？ Supposing the stocks of food run out，what shall we do？假若储备食品都吃光了，我们怎么办呢？ 第9页第9页4provided that. / providing (that ) conj假若 provided / providing （that）从句表示一个假设条件。 He will sign the contract provided (that) we offer more favorable terms假如我们提出更优惠条件，他就会

7、在协议上签字。 He wont be against us in the meeting providing (that) we ask for his advice in advance假如我们提前征求一下他意见，他就不在会上反对我们。第10页第10页5. as ( so ) long as. “只要， 就 ” 表示 一个前提条件Youll succeed as (so ) long as ( if only ) you try hard.只要你努力，你就会成功。第11页第11页but for +短语， 要不是6.But for the rain，we should have a pleas

8、ant journey要不是下雨，我们旅行必定很愉快。=If it didnt rain, we should have a pleasant journey. But for your help, we should not have finished the task in time要不是你帮忙，我们必定不能及时完毕任务。=If you hadnt helped us, we should not have finished the task in time. 第12页第12页Without. +短语， 假如没有.7.Without water, there would be no life on earth at all假如没有水，地球上就不会有生命。= If there were no water, there would be no life on earth at all.第13页第13页If +虚拟条件句，1. If I were you，I would invite him to the party假如我是你，我会邀请他参与聚会。 I would have arrived m