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(共27张PPT)
Unit 6
TV programmes
九年级上册英语 Grammar
Grammar
学习目标
1、学会运用if引导的条件状语从句。
2.学会运用unless引导的条件状语从句。
Presentation
1. 如果你是个足球迷，你不会想要错
过这周的节目。
If you are a football fan, you will not
want to miss this week’s programme.
2. 这种情况将会持续下去除非人们停止为了皮毛和骨头而猎杀老虎。
The situation will continue unless humans stop hunting tigers for their fur and bones.
3. 如果你很容易被吓坏，别看了。
If you get scared easily, do not watch it.
We use if to talk about the result of a possible action. We make sentences with if like this:
If-clause (simple present tense) Main clause
(will/may/might/…+
infinitive)
If you are a football fan, you will not want to miss this week’s programme.
If you are an animal-lover, you may feel sad about it.
Pay attention:
We put a comma after the if-clause when it is the first part of a sentence.
If-clause (simple present tense) Main clause
(will/may/might/…+ infinitive)
If you enjoy solving mysteries, you might like this film.
What will happen if ...
Millie is thinking about herself, her friends and TV plete the sentences with the correct forms of the verbs in brackets.
A1
Work out the rule!
We often use the simple __________
(future, present) tense in the if-clause.
We need a _________ (comma, full stop)
after the in-clause when it is the first part
of a sentence.
present
comma
Asking about animals
Millie watched a documentary about animals. Help Millie answer her father’s questions with the help of the words in the box.
Dad: What will a bear do if it’s in danger
Millie: If a bear (1)____________, it (2)
___________ people.
Dad: What will a polar bear do if it’s
hungry
Millie: If a polar bear (3)______________, it
(4)___________ fish from the water.
attack catch hunt live protect walk
is in danger
will attack
is hungry
will catch
vt./vi. 攻击，进攻
n. 北极熊
Dad: What will elephants do if they’re thirsty
Millie: If elephants (5)_____________, they
(6)___________ until they find a river.
Dad: What will tigers do if they live in the
wild
Millie: Tigers (7)___________ for their
own food if they(8) ______________.
attack catch hunt live protect walk
are thirsty
will walk
will hunt
live in the wild
Dad: What will tigers do if they have babies
Millie: Tigers (9)___________ as a family if
they (10)____________.
Dad: What will male wolves do if there’s
danger
Millie: Male wolves (11)____________ their
families if there (12)___________.
attack catch hunt live protect walk
will live
have babies
will protect
is danger
adj. 雄性的
Using unless
We can use unless to say that something
can only happen or be true in a
particular situation.
e.g. He won’t come to the party unless
you invite him.
Sometimes we can use if ... not to replace unless.
e.g. The situation will continue unless
humans stop hunting them for
their fur and bones.
→ The situation will continue if
humans do not stop hunting them
for their fur and bones.
e.g. Unless it rains tomorrow, we are
going to play football in the park.
→ If it does not rain tomorrow, we are
going to play football in the park.
The unless-clause can come first or after the main clause.
e.g. Unless you try your best, you will
not realize your dream.
You will be late unless you leave
right now.
c
d
f
a
b
e
present
条件状语从句
条件状语从句主要由if或unless引导：
if条件句
1) if条件句：条件句用于陈述语气，表示
假设的情况可能发生，其中 if 是“如果”
的意思。
e.g. If it rains, we will stay at home.
如果下雨我们就待在家里。
Grammar
2) 用法：
(1)条件状语从句通常由连词if引导，意为“如
果、假如”，主句不能用be going to表示将
来，而应该用shall, will。
e.g. If you leave now, you will never regret it.
如果你现在离开，你永远都不会后悔。
(2)if “如果”，引导条件状语从句，主句用一般
将来时，从句则用一般现在时。
e.g. If it rains tomorrow, I shan’t climb the hills.
如果明天下雨，我就不爬山了。
(3)主句是祈使句或含有情态动词，从句也用一
般现在时。
e.g. Please call me if he comes next Sunday.
如果他下周日过来请打电话给我。
注意: 宾语从句中的if与条件状语从句if的区 别。宾语从句中的if “是否”相当于 whether, 引导宾语从句, 时态需根据语境确定。如果主句用一般现在时, 从句可以根据具体情况选用时态, 如果主句用一般过去时, 从句必须用过去时的某种形式。
unless 条件句
unless引导的条件句，表示强烈的否定。翻译为“除非……”“非……不可”。
e.g. You will fail unless you work harder.
你不努力就会失败的。
=You will fail if you do not work harder.
注意: unless 从句里的谓语只能是肯定
式, 因为本身unless表示否定。
单项选择。
1. If there ________ no buying and selling
of animals, there _______ no killing in
nature.
A. is; will be B. will be; will be
C. is; is D. will be; is
A
Exercises
2. I’m waiting for my friend._______,
I’ll go shopping alone.
A. If she comes
B. If she won’t come
C. If she doesn’t come
C
3. We are going to play basketball
_______ it rains.
A. if not B. when
C. except that D. unless
D
4. Eat less food _______ you want to put
on weight.
A. if B. unless
C. until D. as soon as
B
Finish the exercises in the
workbook.
Homework

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