说不准

wǒ shuō bu zhǔn xiàn zài shì shén me shí jiān

我说不准现在是什么时间。

I lost all track of time.

wǒ shuō bu zhǔn dào dǐ fā shēng le shén me

我说不准到底发生了什么。

I can't rightly say what happened.

tā shuō bu zhǔn shì xī wàng tā liú xia

他说不准是希望她留下。

He probably wished her to stay.

jīn tiān shuō bu zhǔn huì xià yǔ

今天说不准会下雨。

It will probably rain today.