The slang expression 可不是
This expression is used to agree with a person you are talking to.
The expression 可不是 
is used in response to someone else’s remark. It emphasizes that the speaker agrees with another person's opinion.
is used in response to someone else’s remark. It emphasizes that the speaker agrees with another person's opinion.Examples
—— 这个女孩子学习得很好
This girl is a very good student!
zhè ge nǚ háizi xuéxí de hěn hǎo
—— 可不是！每天她除了做作业还自学
You bet! Apart from doing her homework, she is engaged in self-education
kě bu shì! měi tiān tā chú le zuò zuòyè hái zìxué
This expression is often used by itself meaning “certainly!”. The particle 嘛 can be placed at the end of the expression.
can be placed at the end of the expression.Examples
可不是嘛！
You bet!
kě bu shì ma
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