资源简介

(共14张PPT)
Unit 2 Communication
语法讲解
冀教版九年级上册
if 引导的条件状语从句
表示主句发生的条件的分句叫条件状语从句，即在某种条件下，一件事情可能发生。
if 意为“如果”，引导条件状语从句时可以放在句首或句末。若位于句首，通常用逗号隔开。
概述
主将从现：主句用一般将来时，从句用一般现在时。
If I have magic, I will fly in the sky.
(一般现在时) (一般将来时)
If it rains, I will stay at home.
用法
主情从现：主句含有情态动词，从句用一般
现在时。
If you drive too fast, you may have an accident.
(一般现在时) (情态动词）
You must stop if the traffic light is red.
主祈从现：主句用祈使句，从句用一般现
在时。
Please call me if he comes next Sunday.
(祈使句) (一般现在时)
Don’t play football if you don’t finish your
homework.
当if引导的条件状语从句为否定句时，可以转换为unless引导的条件状语从句。
If you don’t leave now, you’ll be late.
Unless you leave now, you’ll be late.
unless 如果不、除非
拓展
含有if 的条件状语从句可以转换为“祈使句+and/or+ 一般将来时的陈述句”。
If you work hard, you will succeed.
如果你努力工作，你就会成功。
Work hard, and you will succeed.
(祈使句) (一般将来时)
If you put on your coat, you ________
so cold.
A．feel
B．will feel
C．won’t feel
模拟考场
If my brother ______ the math exam, he ______ a new basketball as a gift.
A. pass; gets
B. passes; gets
C. passes; will get
D. pass; will get
模拟考场
翻译句子。
如果你每天坚持读英语，你的阅读能力会提高很快。
_________________________________
_________________________________
If you keep reading English every day, your reading ability will improve quickly.
模拟考场
句型转换。
If you get up early, you will catch the first bus.（改为同义句）
______ ______ early, ______ you will catch the first bus.
Get up
模拟考场
and
连词成句。
if, carefully, you, follow, the, can, you, instructions, make, the, model, plane, successfully,(.)
____________________________________
____________________________________
If you follow the instructions carefully,
you can make the model plane successfully.
模拟考场
连词成句。
if, you, don’t, on time, the, to, come, meeting, will, your, friends, wait, for, you, no longer,(.)
____________________________________
____________________________________
If you don’t come to the meeting on time,
your friends will no longer wait for you.
模拟考场

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