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S4: I must run quickly on the road. （可有其他回答）
S5: No,you mustn’t run quickly on the road!
……
Ask and answer
Model:
Red man, stop. Green man, go!
What must we (not) do on the road?
Let’ review
can
can’t
wait on the pavement
cross the road with other people
cross the road here
find a zebra crossing
can not
must
mustn’t
look for a zebra crossing
look at the traffic lights
play football on the road
run on the road
You
You
.
.
dangerous
important
alternative
可选择的
读规则，感知can和must的区别。