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语法纸》
Day55条件状语从句
条件状语从句的用法
二、
条件状语从句的时态
1,f是常状语从句引导词，意为“如果”，
1.主句是一般将来时、祈使句或含有情态动词时，从句
e.g.If it rains tomorrow,we will stay at home.如果明天用一般现在时表示将来，
下雨，我们就待在家里。
e.g.If it snows tomorrow,we will stay here.如果明天下雪
2.unless表示反面的条件，意为“除非；如果不”。
了，我们就留在这里
e,g.You will be late unless you hurry up.如果你不快点，
Go to school if it doesn't rain.如果不下雨就去上学。
你就会迟到.
三、条件状语从句的转换
3.so/as long as表示真实条件，意为“只要；如果”。
1.if not相当于unless,意为“如果不；除非”。
e.g.As/So long as you keep your promise,I won't disturbe.g.Unless you listen carefully,you won't know the answer.
you any more.只要你保守承诺，我不会再打扰你..
If you don't listen carefully,you won't know the answer.
4.in case表示不确定的条件，意为“万一”.
如果你不认真听讲，你不会知道答案。
c.g.Take some cash with you in case there is no Internet2.祈使句+and/or+一般将来时句子=if从句（肯/
connection.带一些现金以防那里没有网络连接。
否定)+一般将来时句子
5.once意为“一旦”。
e.g.Hurry up,or you will be late.
eg.Once you understand the rules,,you'll enjoy the game..-If you don't hurry up,you will be late.快点，否则你会迟
一旦你理解了规则，你就会喜欢这个游戏，
到的。
治虫线对所.上记话法卜统题
Day55语法专练
姓名：
日期：
耗时：
一、
单项选择
1.-I wonder if Li Hua
to the hospital to receive
6.I don't know
he will come tomorrow.
he
the vaccination
(疫苗接种)·
comes,I'll tell you.
-I am sure he will if he
time.
A.if;Whether
B.whether;Whether
A.goes;will have
B.will go;has
C.if;That
D.if;If
C.will go;will have
D.goes;has
7.
Betty comes,please tell her to wait.
2.As we live in a rapidly developing world,we
A.If not
B.Unless
C.In case
D.So that
behind
we keep learning.
8.
you can use your dictionary,you will learn English
A.will be left;unless
B.will leave;if
belter.
C.will be left;after
D.will leave:though
A.If
B.Unless
C.Though
D.Before
3.My parents won't allow me to do things I like
9.There are no buses to the beach.
you have a car,it's
finish my homework.
difficult to get there.
A.if
B.but
C.because
D.unless
A.Since
B.After
C.Unless
D.Because
4.It is really dangerous
people run the red traffic
10.-I wonder if Sally
us prepare for the party.
light.
I'm sure she will if she
time.
A.if
B.unless
C.though
D.until
A.helps;will have
5.We will stay at home if my aunt
to visit us
B.will help;has
tomorrow.
C.will help;will have
A.comes
B.come
C.will come
D.is coming
D.helps;has

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