"Zhège háizi yuèláiyuè dǒngshì le." "Kěbùshì, zhǎngdà le bùshǎo."
"This child is becoming more and more sensible." "That's right, he's grown up a lot."
Tips
usage
可不是 is a conversational expression used to strongly agree with what someone just said. It's very colloquial and natural in spoken Chinese. Often followed by 嘛 (kěbùshì ma) for emphasis.
memory
Think of it as a rhetorical question: 'Isn't it (exactly like you said)?' — of course it is! That's the agreement.
