Unit 6 pets 第四課時(Pages94~97)
you must arrive at school at 8.10 in the morning.
you ought to walk slowly on the stairs .
you should hand in your homework to the monitor.
the class has to choose a class monitor .ask
what are his/her duties?e.g.,
he /she must collect the exercise books .
he/she should make sure that students follow the schoo l rules.
7. ask students to read the four letters in part b2 carefully. make sure that they understand the messages well. ask them remember and to check the words in th eir dictionaries.
8. in part b3, students can read some of the answers which give advice to the writer of each letter. students check answer s with a partner.
9. divide the class into groups of four .one group comes to the front of the class and each member reads one letter at a time .
a representative from another group responds by reading his/her advice. you could turn this into a competition. if the sentence is correct ,the group wins a point .if not ,the chance goes to the next group. students correct their own sentence.
we use ‘should’and ‘should not/shouldn’t’to give advice and to
tell people what is the best or right thing to do.’ought to’and
‘ought not to/oughtn’t to’have similar meanings.
( 但 前者隱含了個人的觀點,因此語氣稍弱;后者語氣稍強,常用于指
外部強加的法律或規定.)
we use ‘must’ to tell people that it is neces sary or very important to do something.we use ‘must not/mustn’t’to tell people that it is necessary or very important not to do something.
(‘must’語氣最強,表示某件事完全必要.)
1.‘must’ 的三種用法:
(1)指做某事非常有必要或很重要,側重指主觀意愿,否定回答用
needn’t.(如果表示 受客觀情況所逼,不得不做某事,常用‘ have to’.)
我今天必須做完家庭作業嗎?不,不必了./是,必須.
_______ i finish my homework today?no,you____ __./yes,you_____.
你不得不呆在家 ,因為天在下雪.
you _______ _______stay at home becau se it is______.
(2)must not/mustn’t表示“ 不允許”.
你千萬別玩火.you ______ ______ _______ fire.
紅燈時,你千萬不能穿馬路.
when the traffic lights are red,you ______ ______ the road.
(3)表示肯定的揣測,“ 準是,肯定是”,否定式為‘can’t’.
那個人是誰?一定是我們校長.不可能是他,他去北京了.
who’s that man?it ______ ______ our headmaster.
it ______ _______him. he has gone to beijing.
extension activity
ask more able students to come up with their own advice to the pet owners .tell them to choose two things you should (not)ought (not) to do when you own a pet. they then write sentences givi ng instructions. ask students to read out their advice to the class.