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be/arrive late for class
A: ____we arrive/be late for class?
B: No,we _____.
We ____ arrive/be late for class.
be on time for class
We be on time for class.
arrive/be late for class.
.
must/have to
Don’t
Can
can’t
can’t
eat in the classroom
B: No,we____ .
We ___ eat in the classroom.
eat in the dinning hall
B: But we ____ eat in the dinning hall.
We eat in the dinning hall.
eat in the classroom.
A: Can we ____ in the classroom
Don’t
must/have to
eat
can’t
can’t
can
观察并探究（一）
A: Can we run in the hallways?
B: No,we can’t.