新目标英语八年级下第单元知识点.doc
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Unit 6 An old man tried to move the mountains
Topic: Tell a story
Teaching Aims:To master the Structure of Conjunctions unless, as soon as and so…that
Key point:The usage of unless, as soon as and so…that
Sentences:What was/were sb. doing? 某人正在做什么?
Sb. was/were doing sth. 某人正在做某事。
It is+n. +to do sth. 做某事是……
Language points
状语从句是由从属连词引导,与主句连接,位于句首时,常与主句用逗号分开,位于句末时,其前一般不用逗号。状语从句根据用途分为时间状语从句,原因状语从句,结果状语从句,条件状语从句,让步状语从句,方式状语从句,目的状语从句等。
as soon as
引导时间状语从句意为“一……就”,若主句是一般将来时,从句要用一般现在时表示将来的意义。
I will do some cleaning as soon as I finish my homework.
unless引导条件状语从句相当于if…not,表示否定,意为“除非”,若主句表示一般将来时,从句要用一般现在时表示将来的意义。
I won,t go to tomorrow,s party unless I am invited.
Unless 的条件句 表示在特定条件下,才决定做或不做一件事,中文用的连接词一般是“除非”和“否则”。如:除非刮台风,否则演唱会将如期进行。在英语中,我们可以用unless表达这个意 思,相当于if not。以这个句子为例:
The concert will be held as schedule unless there is a typhoon. = the concert will be held as schedule if there is not a typhoon
If 和 unless引导的条件状语从句
条件句表可能,主句多用将来时;
条件句表事实,主句常用现在时。
We can walk there if we can,t find a bus.
如果我们找不到公车,也能走路去那里
If it rains tomorrow, we will not go to the zoo.
如果明天下雨,我们就不去动物园
What will you go if you find someone in danger?
条件状语从句 If 条件句有不同的类型,简述如下:
(1)用if条件句表达客观真理或普通现象 If条件句用于表达客观真理或普通现象时,主从句时态均用一般现在时,If you freeze water, it turns into ice.
(2)用if 条件句表示将来可能发生的事情 在表示将来可能发生的事情的if条件句中,主句用一般将来时,而if从句用一般现在时表示将来的时间,即主将从现
注意:在条件句中,主句部分只能使用动词will的一般将来时,不能使用be going to的结构
练习
If I ________ his phone number, I will tell you.
find B. found C. will find D. have found
We will go camping if it _______ tomorrow.
Wont rain B. didnt rain C. doesnt rain D. isnt raining
Im waiting for my friend. If he _______, I ______ swimming alone.
doesnt come; will go B. wont come; will go C.will come; wont go D. dont come; will go
______ you go to the supermarket at 7 p.m, you can buy a lot of cheap food.
If
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