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1.learn to use if-clause;
2.learn to use unless-clause；
3.learn to use “主将从现” 原则。
if 可以用来引导条件状语从句，此时，if 通常表示“假如”。
*
If You Are Happy
If you are happy and you know it ,
clap your hands.(主句)
If you are happy and you know it ,
stomp your feet.(主句)
If you are happy and you know it,
shout horray.(主句)
If you are happy and you know it,
do all three.(主句)
1.如果主句是祈使句，if从句通常用一般现在时。
e.g.
Please?call?me?if?he_______ (come) next?Sunday.
如果他下周日过来请打电话给我。
Don't play computer games if you _________(not finish)
your homework.
如果你不完成作业就不要玩电脑游戏。
don’t finish
comes
祈使句
祈使句
We use if to talk about the result of a possible action. We make sentences with if like this:
If-clause（条件状语从句）
(simple present tense)
Main clause（主句）
(will/may/might/…+