今天可能会下雨,说不定我们明天会去爬山。
jīntiān kěnéng huì xiàyǔ , shuōbùdìng wǒmen míngtiān huì qù páshān 。
It might rain today, maybe we will go hiking tomorrow.
他没有来,说不定他在忙。
tā méiyǒu lái , shuōbùdìng tāzài máng 。
He didn't come, maybe he's busy.
说不定这部电影会很成功。
shuōbùdìng zhè bù diànyǐng huì hěn chénggōng 。
Maybe this movie will be very successful.