说不定

说不定他已经到了。

Shuōbudìng tā yǐjīng dào le.

Maybe he has already arrived.

明天说不定会下雨。

Míngtiān shuōbudìng huì xià yǔ.

It might rain tomorrow.

说不定这次考试你能考第一名。

Shuōbudìng zhè cì kǎoshì nǐ néng kǎo dì-yī míng.

You might be first in this exam.