内容正文:
Unit 2
●>》
No Rules,No Order
Grammar
《学海风暴》七年级英语RJHN版·下册
单元语法突破
语法1祈使句
1.定义:表示命令、警告或请求的句子。
2.祈使句的句式结构:
(1)V型祈使句:V(行为动词的原形)+
其他
Hurry up!快点儿!
(2)B型祈使句:Be十形容词十其他.
Be quiet,please.请安静。
(3)L型祈使句:Let十sb十动词原形十
其他
Let him have a rest.让他休息一下。
(4)D型祈使句:Don't十动词原形十其他,
Don't make noise.不要制造噪声。
(5)N型祈使句:No十动词的现在分词十
其他。
No swimming here!此处不准游泳!
注意:V型和B型祈使句在变否定句
时,要在句首加don't改为D型祈使句;V型
和B型祈使句有时在句子里加please来缓
和语气。
语法2must与have to的用法联系与
区别
1.用法联系:
must与have to是两个常见的情态动词,
其后都接动词原形。
2.用法区别:
(1)must强调说话人的主观看法,表示主
语“必须”做某事;have to强调客观需要,表示
主语“不得不”做某事。
(2)must只有一种形式,可以和任何人称
连用;而have to有形式的变化。
(3)must的否定形式是mustn't,表示“禁
止”;而have to的否定形式是don't/doesn't
have to,表示“不必要”。以must开头的一般
疑问句,其否定答语通常为“No,sb needn't./
No,sb don't/doesn't have to.”。
语法
知识集训
I.用所给词的适当形式填空
Ⅱ.从方框中选择恰当的情态动词填空
(not eat)in the classroom,but
can
can't
must
have to don't have to
you can eat outside.
1.Jim,you
clean your room now.It's
2.Let him
not
play )the
so dirty.
computer games.
2.You
eat too much ice cream.It's
3.
(do)your homework first.
not healthy.
4.Please
(be)quiet in the library.
3.Cindy lives with her grandparents and she
5.No
(drink).
see her parents only on weekends.
6.Jack,
(get)up quickly.
4.My bike doesn't work so I
walk
7.
(not be)late for the meeting.
to school.
8.
wear your school uniform,
5.You
do your homework
Tony.
right now.You
do it after dinner.