说不定

zhè gè wǒ kě shuō bu dìng

这个我可说不定。

I'm not sure about this.

nà kě shuō bu dìng méi zhǔn wǒ jiù kǎo shang dà xué le

那可说不定，没准我就考上大学了。

Maybe I will be admitted to university.

nǐ bié zháo jí xiàn zài yī qiè dōu hái shuō bu dìng

你别着急，现在一切都还说不定。

Don't worry, everything may still be right now.

bié shuō tā le shuō bu dìng tā jiù zài gé bì ne

别说她了，说不定她就在隔壁呢。

Stop talking about her, perhaps she is in the next room.

shuō bu dìng tā yǐ jīng lí kāi le

说不定他已经离开了。

Maybe he's already left.

shuō bu dìng tā men zài bàn lù shang huì yù dào yǔ

说不定他们在半路上会遇到雨。

They might get rained on on the way.