先前

我wǒ先前xiānqián在zài中国Zhōngguó住zhù了le六liù个gè月yuè。

I've lived in China for six months.

我wǒ先前xiānqián就jiù知道zhīdào这zhè一yī刻kè将会jiānghuì到来dàolái。

I knew this moment would come earlier.

不好意思bùhǎoyìsi，让ràng我wǒ指出zhǐchū先前xiānqián文章wénzhāng的de三sān个gè错误cuòwù。

Excuse me, let me point out three mistakes in the above article.

我们wǒmen先前xiānqián不bù知道zhīdào要yào怎么zěnme做zuò，所以suǒyǐ才cái求助qiúzhù。

We didn't know how to do it, so we asked for help.