Unit7 Grammar学案
姓名：___________ 班级:______________
探究一：条件状语从句结构
1._____+if+________________
e.g.You should try it by yourself if you want to know how deep the river is.I will go to his birthday party if he invites me.2._______________，______
e.g.If you go into the river, you will be drowned.If he invites me, I will go to his birthday party.探究二：条件状语从句时态
规则1：if引导的条件状语从句，主语含有情态动词can/could/must/should/may/might等时，从句用_________时态。
If it stops raining, we can go outside.If all your answers are right, you can go to Hainan for holiday.You may stay to dinner if you like.规则2：if 引导的条件状语从句，表示在某种条件下某事很可能发生时，if从句用___________，主句用____________。
If it doesn’t rain tomorrow, we will have a picnic.If he runs, he won’t be late for school.If it rains tomorrow, we will stay at home.规则3：if 引导的条件状语从句，主句是祈使句，从句是__________时态。
Dont wait for me，if Im late.Stay at home if it rains tomorrow.Dont play basketball if you dont finish your homework
规则4：if 引导的条件状语从句，表示在某种条件下某事一定会发生时，if从句用___________，主句也常用___________。
If you put salt into water, it disappears.If you take a fish out of water, it dies.If you heat(加热)ice, it turns into water.探究三：条件状语从句引导词
1.if 如果
2.unless 除非 如果不相当于（if...not...）
3.as long as 只要...就...You wont pass the exam unless you work hard.As long as you get up early, you will catch the bus.探究四：同义词转换
1.祈使句+and+简单句 and 表顺承“那么”
If you study hard, you will pass the exam.＝
2.祈使句+or+简单句 or 表转折“否则”
If you dont hurry up, you will be late.＝
3.unless与if...not...转换
We will go for a picnic unless it rains tomorrow.＝
探究五：注意事项
1.主句将来时态中多用will,一般不用be going to
2.当if 表示是否时,从句不是条件状语从句，而是宾语从句, 此时不遵循“主将从现”, 从句该用什么时态就用什么时态。
e.g.I dont know if he has come here.Tom asked if I had read the book.3.在if引导的条件状语从句中不能使用some，而要用any。
e.g.If you have any questions to ask, please come to my office.练习：
1.If it ______(rain)tomorrow, we _________(not go)to the park.2.If the weather____(be)fine this weekend, we __________(drive)to the coast.3.If she _______(write)the letter today, she ________(post)it tomorrow.4.If Marcia lives alone, she _________(keep)a pet parrot.5.Flowers _________(die)if you ____________(not water)them for a long time.1.Our English teacher is nice and patient _______ she is very strict with us.（2020安徽）
A.if B.as C.unless D.though
2.If you take this train, you ________ in Shanghai in five hours.（2020北京）
A.arrive B.will arrive C.arrived D.have arrived
3.Nobody can hear you _______ you speak in a louder voice.（2020重庆）
A.unless B.if C.when D.after
4.In some cities of China, you’ll get fined _______ you don’t walk along the crosswalk while crossing the road.（2020福建）
A.if B.though C.until
5.---Would you like to go hiking if it ______ fine this Saturday?
----I’d love to.But nobody knows if it __________.（2020黔东南）
A.is;will rain B.is;rains C.will be;will rain D.will be;rains
Role play：
Make a story or conversation(use unless or if..not)in groups.e.g.(1)You wont go out to play unless you practise playing drum.(2)You wont grow up unless you eat some vegetables.
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