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英语Unit 4 Road safety一等奖ppt课件
展开教师将全班学生分为成两组,每组推选一名“警察”, 两组组员任意就行路安全知识进行提问,两个“警察”做判断,回答又快又正确的“警察”获胜。
Can I play ftball n the rad?
N, yu mustn’t.
Hw can yu crss rads safely?
What must we d t crss the rad safely?What mustn’t we d n the rad?
mustn’t run r play
lk at…wait fr…
wait n the…lk ut fr…first… then… and then… againcrss the rad with…
Fllw the rules and stay safe!
We must lk fr a zebra crssing. At the zebra crssing, we must lk at the traffic lights.We must wait fr the green man.
Yu must lk fr a zebra crssing.Yu must lk at the traffic lights.Yu mustn’t play ftball n the rad.Yu mustn’t run n the rad.
mustn’t= must nt 禁止
Let’s review these.
can’t= cannt 不能
都是情态动词,后接动词原形,没有人称和数的变化。
情态动词must/can/shuld的用法
Read and say:Which has the strngest tne(语气)?Which has the weakest tne?Which means permissin(允许)?
Yu must g nw, r yu will be late!
Yu can g nw, r yu will be late!
“Must” has the strngest tne.“Shuld” has the weakest tne. “Can” means “permissin”.
Yu shuld g nw, r yu will be late!
must意为“必须”,语气最强,表示命令或权威;其否定形式是mustn’t,意为“禁止”。
Yu must get here n time.你必须准时到达这儿。(语气最强)
can意为“可以;能;会”,表示许可,也表示能力或可能;其否定形式是cannt,也可缩写为can’t。
Yu can get here n time.你能准时到达这儿。(表示能力)
shuld意为“应该”,表示建议,语气最弱;其否定形式是shuldn’t。
Yu shuld get here n time.你应该准时到达这儿。(语气最弱)
Read and circle
Can/ Must I watch TV?
N, yu can’t/ mustn’t. It’s late. Yu can/must g t bed nw.
But yu can’t/ mustn’t run fast n the rad.
I can/ must run fast.
What can/ must yu d?
Can/ must I g t see the dctr?
Yes, yu can/must. Yu can’t/ mustn’t g t schl because yu’re sick.
“必须”语气最强,表示命令或权威。
表示有能力或有权利做某事。
表示没有能力或权利做某事。
“禁止”表示说话人“不许”和“禁止”某人做某事,有很强的劝告语气。
Think and Write
Cmplete the pster with “must” and “must nt”.
Classrm rulesYu __________ run in the classrm.Yu __________ keep yur desk clean and tidy.Yu __________ eat r drink.Yu __________ play ball games.Yu __________ talk ludly.Yu __________ keep the classrm clean.Yu __________ listen t yur teachers in class.
must→ “必须”,表示命令和权威,语气最强。
归纳情态动词must/mustn’t 用法:
复习情态动词can/can’t/ shuld/ shuldn’t 用法:can→“能,能够”,表示能力,允许。shuld→“应该”,表示给建议,语气最弱。
can can’t must mustn’t shuldn
1. Tm, yur rm is messy. Yu _______ put yur things in rder.2. Here’s the red man. Yu _______crss the rad.3. Children _______ play ftball n the rad.4. The sign means we _______ keep quiet here.
5. I ______ g shpping with yu because I am busy nw.6. Yu _______crss the rad with ther peple. Then the driver _______ see yu easily.7. I have a headache. What _______ I d?8. —What_______ yu nt d in the library? —We_______ eat r drink.
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