You are having trouble taking a test because the student next to you is making noises.
:)
You are having trouble seeing the board.
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You forgot your homework at home.
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Your teacher asked you a question and you don't understand.
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Something is missing from your lunch order.
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You didn't understand the teacher's directions
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You didn't hear the teacher's direction and notice that everyone is starting the assignment.
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You do not understand a problem on a worksheet.
:)