备不住

tā bèi bu zhù shì wàng le zhè shì

他备不住是忘了这事。

For all we know, he forgot about the matter.

bèi bu zhù tā yǐ jīng tīng shuō le

备不住她已经听说了。

Probably she has been told about it.

zhè yī nián bèi bu zhù yòu shì gè fēng shōu nián

这一年备不住又是个丰收年。

This year may be another good year.