条件状语从句公开课课件.ppt

Grammar,if 从句,Revision,What will I do if it is sunny this weekend?,sleep,play computer games,go shopping,?,Part1:If 的用法,1.I want to know if he will go to park with us.,2. We will have a picnic if it doesnt rain.,3. If you boil water, it becomes steam.,4. If you feel tired, you must have a rest.,宾语从句,条件状语从句,巧计、速记,语法1：if作为宾语从句的引导词，引导宾语从句。（是否）,语法2：if（如果）引导的条件状语从句,宾语从句, if 用于宾语从句中,whether /if,改为陈述句 语序,由从属连词whether, if 引导的宾语从句,e.g. 1. I want to know _. （他是否跟我们一起去公园） 2. Ask him _. （他是否能来） 3. I didnt know _.（是否要下雨）,if (whether) he will go to the park with us,whether (if) he can come,whether it was going to rain or not,当句末为or not时，引导词只能用whether而不能用if.,If 与whether 的区别,I dont know _ he will come or not. I dont care of _ he is handsome. He wondered _ to stay here the next week. _ he will come is not decided.,与or not 连用只能用whether,介词后只能用whether,与to do 不定式连用只能用whether,作主语只能用whether,If 引导条件状语从句,If it is sunny this weekend, what will you do ?,If it is sunny this weekend, I _ football with my classmates.,If it is sunny this weekend, I_.,will play,If it is sunny this weekend, what wont you do ?,If it is sunny this weekend, I _.,If it is sunny this weekend, I _.,Wont stay at home,wont watch television,If you have a picnic at weekends,what will you buy?,If_,_.,If dog bites you, what should you do?,Ask for help from teachers / parents / friends.,wash the wound,call for help,take medicine,see the doctor,If a dog bites you, first, you should_ _. Then, you should_. Next, you should_. And you should,Stay cool,if 条件句不一般, 几个要点记心间; 条件句,放在前, 逗号要放句中间。 条件句表可能， 主将从现不一般； 条件句表事实， 主句常用现在时 If还有“是否”意 , 宾语从句放后边,summary,分析试题特点及做题思路：,考连词- 做题思路 考时态-做题思路：,分析句子- 判断关系- 选择正确的if的用法,认字- 判断语境提供的时态特点- 选择正确的时态,1.Im sure if he _(go) to the party, he_ (have) a great time. 2.If the rain _(stop) tonight, we will go to the cinema. 3.Ill buy a computer if I _(have) enough money. 4.You _(not get) nervous if you _(do ) enough exercise. 5.I want to know if he _(come) tomorrow, if he _(come), I _(give) the massage to him.,goes,will have,stops,have,wont get,do,comes,will come,will give,Exercise:,Part2:Unless的用法,You will fail to arrive there in time unless you start earlier.,If you dont start earlier, you will fail to arrive there