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I don’t want to fall behind. I must catch up with my classmates.
You can/may practise speaking English with us during the walking.
You have walked 33,333 meters. You must feel tired. Come in and have a rest.
We may get to the last stop before 7:00pm. Only five kilometers is left.
1 I am sure I can walk 50 kilometres.
2 I don’t want to fall behind. I must catch up with my classmates.
3 You can/may practise speaking English with us during the walking.
4You have walked 33,333 meters. You must feel tired. Come in and have a rest.
5 We may get to the last stop before 7:00pm. Only five kilometers is left.
结构：modal + ?
动词原形
I am sure I can walk 50 kilometres.
necessity
possibility ability permission
=I am sure I __________ walk 50 kilometers.
am able to
I don’t want to fall behind. I must catch up with my classmates.
necessity
possibility
ability
permission
= … It’s ___________ for me to
catch up…
necessary
（需要）
You can/may practise speaking English with us during the walking.
necessity（需要）
possibility ability permission
= You are _________ to practise ..
allowed