八年级第七单元语法if 课件

6.I ____ her the answer if she ____me. A. can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks
1
2
The wheels won’t turn easily unless you make them round.
你会用另一种方式表达吗？
B2 Rewrite the following sentences with unless.
2.You will get a toothache if you do not brush your teeth everyday. You will get a toothache unless you brush your teeth everyday. _____________________________________________ Unless you brush your teeth everyday, you will get a toothache. ____________________________________________ 3.This room will get very hot if you do not open the window. This room will get very hot unless you open the window. ____________________________________________________ ____________________________________________________ Unless you open the window , this room will get very hot . 4.If you do not close that window,flies will get in. Unless you close that window,flies will get in. ____________________________________________________ ____________________________________________________ Flies will get in unless you close tha t window. 5.I will leave this restaurant if the waiter do not come soon. I will leave this restaurant unless the waiter comes soon. ____________________________________________________ unless the waiter comes soon,I will leave this restaurant. ____________________________________________is easier to remember these steps if you understand how the water cycle works.
When ?
• If you put salt into water,
it disappears.
这种情况大多是客 观事实或习惯性动 作，我们也可以用 when来代替if.
4.A plant grows if you water it.
5.A glass breaks if you drop it.
A2 In pairs, make conversations about the sentences in A1 on page 103. Follow the example.
It
名 词 ， 代 词 的 转 换
1.A fish dies if you take it out of water.
2.The room becomes dark if you swith off the lamp.
3.The wood floats if you put it into water.
主句还可以是什么样的句子？
If you want to remember how to spell the word
“because”, you can use the sentence “Big
elephants can always understand small elephants”.
Please call me if he comes back.
More exercises
1. If you _____ to the party, you’ll have a great time. A. will go B. went C. go D. going 2. The glass ------if you drop it . A . drop B. drops C. droping D. will drop 3.– What are you going to do tomorrow? --We’ll go to the library tomorrow if it ____. A. isn’t rain B. rain C. won’t rain D. doesn’t rain
小组合作得怎么样？ 我学会了什么？
1.在某种条件下，某事有可能发生时，
时态
If 条 件 句
主句用————，从句用—————。 一般将来时 一般现在时
2.在某种条件下，某事肯定会发生时， 一般现在时 一般现在时 主句用—————从句用————。
位置
If---not
逗号 主句从句；从句 _____主句
A3 Complete these sentences with the words in brackets.
Grammar B if …not and
unless
The word unless can mean if ... not
B1 Draw lines to match the beginnings of the sentences in Column A with the endings in Column B.
Oxford English
Unit
7
Memory
Grammar
用所给动词的适当形式把文中的句子补全。 make （1）If you —————the picture big, strange will remember or silly, you ————————it better.（ make remember） want （2）If you ————to remember how to spell the can use word “because”, you—————— the sentence “Big elephants can always understand small elephants”. （ want use ）
unless 和 ————转换
用unless或if 引导的条件状语从句完成下面的句子
1.You will not remember these steps _________________. 2.Students will not learn English well _________________. 3.If you don’t feed the fish_____________________. 4.The environment will get worse ____________________. 5.We will not be successful _________________________.
If you put salt into water, it disappears.
Salt disappears if you put it into water.
主 从 句 位 置
千万要注意名词和代词的转换
A1 Read these if-clause and draw lines to match them with the results.
4. If it ______ sunny tomorrow, I ____ boating. A. is go B. will be, go C. is, will go D. will be, will go 5. If you heat metal,it------. A.melt B melts C will melt D. Melting
The wheels won’t turn easily don’t _____you_____ make them round. If
If you don’t plant the seeds in the soil,they won’t grow Unless ---------------- you plant the
seeds in the soil, they won’t grow.
3
4
The meat will go bad unless you put it in the fridge. Unless you put the meat in the fridge, it will go bad.
Unless you wear your glasses,you won’t see clearly. You won’t see clearly unless you wear your glasses.