HSK 7-9
可不是
kěbúshi副
(coll.) exactly!; indeed; that's for sure
可不是，这场雨来得太及时了。
Kě bú shi, zhè chǎng yǔ lái de tài jí shí le.
Exactly, this rain came just in time.
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Appears across levels (7-9) in the HSK 3.0 word list.