1、引 导 词： if (如果, 假如)时态要求：当主句是一般将来时的时候，if 引导的条件从句中要用一般现在时如：If hunters catch a giant panda, they will kill it for its fur._从句一般现在时_/ _主句将来时_/There will be no giant pandas in the world soon if we do nothing._主句将来时_/ _从句一般现在时_/注意：if 的从句若在前，主句在后，则中间用逗号隔开。若主句在前，从句在后，不用符号。1.If farmers_（cut down ）trees and fo
2、rests, giant pandas _（ have ）nowhere to live. Giant pandas _ （have） nowhere to live if farmers_ （cut down ）trees and forests.2.If they _（be） hungry, they_(eat) bamboo shoots.They _ (eat) bamboo shoots if they _（be） hungry.一、用动词的适当形式填空。1.If I _ (have) enough time, I _ (help) many people.2.If it _ (ra
3、in) tomorrow, I _ (stay) at home.3.If you _ (work) hard, you _ (learn) English well.4.If it _ (not rain) tomorrow, we _ (have) a trip.5.We _ (go) fishing if it _ (be) fine next Sunday.二、将下列句子改为同义句。1. Work hard, and you will pass this exam.（用 if 改为同义句）you hard, you this exam.2. You can help me./ I am
4、 very thankful.(用 if 连接下列句子)三、根据中文完成下列句子。1. 假如我看到前面有一条蛇，我会掉头就跑。If I _ a snake in front of me, I _ _ the other way. 2. 假如我们保护大熊猫，他们就能生存下去。_ we _ giant pandas, they _ _.小组讨论总结规则:1.时态：if 引导的句子用一般现在时，主句用何时态_ 2.句子的结构: 当我们把 if引导的条件状语从句放在句子开头时，我们需要在条件状语从句后用_号。假如主句在开头，则没有必要加 _号。四、当堂巩固。用所给的动词填空1. If he _ (wa
5、tch) the animal carefully, he _(get) enough information.2. I cant finish the work if you_ (not help) me.3. If you dont go there tomorrow, I _(not go), either.4. _(not cross) the road if the light_ (be) red.5. If a giant panda _ (have ) no food, it _ (die).6. The baby panda _ (live) on his own if his mother _ (leave) him for two whole days.7. If we _ (not do) anything, soon there _ (be) no pandas in the world.翻译1. 如果你吃我的食物，我就不和你讲话. 2.如果我不吃食物，我就会死. 3.如果我死了，就没人照顾你了。4. 如果明天不下雨,我就去公园.
