十之八九

shí zhī bā jiǔ míng tiān bù huì xià xuě

十之八九明天不会下雪。

It will not snow tomorrow very probably.

shí zhī bā jiǔ tā bù huì chí dào

十之八九他不会迟到。

It is ten to one that he will arrive timely.

shí zhī bā jiǔ tā yǐ jīng shī xìn le

十之八九他已经失信了。

Most likely he has broken his promise.

wǒ cháng cháng gěi tā fā diàn yóu dàn shí zhī bā jiǔ tā dōu bù huì huí fù

我常常给他发电邮，但十之八九他都不会回复。

I'm always emailing him, but nine times out of ten he doesn't reply.