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Ask questions.
1, Our school day is over at 3 oclock.
Yes/No
Wh-
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2. Mike plays with his friends after the lessons.
Yes /No
Who
Or

 1 Is our school day over at 3 o’clock?

When is our school day over?

 Our school day is over at 3 o’clock, isn`t it?

 2. Does Mike play with his friends after the lessons?

Who plays with his friends after the lessons?

Does Mike play with his friends after the lessons or before the lessons?