Answers

2016-01-25T10:43:13+05:30
They should tell the teacher about it and if the teacher does not do anything about it, complain to the principal.
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2016-01-25T12:10:16+05:30
They should properly teach him a good lesson by giving punishment
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 First ypu should find the reason behind it, why he or she  is stealing, after that once try to talk to him and percive him to not to do so.
but we can think  and give proper punishment also... that sometime teacher can't do. i understood what u want to say but sometime this decision should be taken