3. 如果主句是祈使句，从句同样 要用一般现在时。
Don’t go and play football if you don’t finish your homework. Please call me if he comes next Sunday.
练一练：
1。如果她早点儿起床，就有时间在家里吃早餐 If she____ ____a little earlier, she’ll have time to eat breakfast at home.
If you often ____ ___English songs, you___ ___English.
Look and say
If I’m ill, _________ _________ .
If I am hungry,I will eat some food.
If I am tired,I will have a rest.
If引导的条件状语从句
八年级英语
If you are happy, what will you do?
If I am happy, I will smile
If you become sad, what will yo homework.
She gets good grades.
I’ll go with you if you don’t want to go alone（从句）.
2.如果主句含有must, may, can 等 情态动词，从句也要用一般现在时。
If you finish the homework， you can go home．
You must stop if the traffic is red.
主句一般将来时 ，从句用一般 现在时。
构 成
条件从句
主句
时 If＋一般现 主语＋shall/will+动
态 在时
词原形
例 句
If he comes,
he will take us to the zoo.
用法：
1. 如果主句是一般将来时，从句
则用一般现在时。
If it rains（从句）， I will stay at home.
If it rains tommorw,I will watch TV at home.
If it doesn't rain,I will play basketball.
1 If I _______________(not understand）, I will ask my teacher for help .
2 If I __________(copy ) your homework , I will cheat myself .
3 If she _______________(not get ) up early , she’ll miss the early bus .
4 If your mother_______ (buy) the book for you , it will be good for your study.
If I have enough money, I will travel around the world =I will travel around the world if I have enough money
If条件句：条件句用于陈述语气， 表示假设的情况可能发生， 其中 if 是“如果”的意思。
If you are hard-working,you will get good grades.
Lead-in
She is going to walk to shool. She will be late. If she walks to shool,she will be late.
If 引导条件状语从 句
2。如果你参加聚会，你将会过得很开心。 If you____ the party ,you_____ ____ a great time.
3。如果明天下雨，我们将不去野餐 If it ____tomorrow, we ___ ____ for a picnic. 4。如果你经常听英文歌，你将会喜欢 英语
定义：if”如果，假如“，它引导的句子表示 某事发生所需要的条件，即，“在······条件下， 某事才能发生，”在句子中充当状语，因此叫 状语从句。（ If引导的条件状语从句表示假如有
从句的动作发生，就会有主句动作的发生 ）
位置：从句可放在主句之前或之后，但 是放在主句之前须有逗号隔开
eg:如果我有足够的钱，我就去 环游世界
If引导条件状语从句：译为“如果，假如” (1) if从句+祈使句 (2) if从句+主句（一般将来时） (3) if从句+主句（含有情态动词）
Bey!
谢谢收看