Examples
wǒ我xiān qián先前zài在zhōng guó中国zhù住le了liù六gè个yuè月。
我先前在中国住了六个月。
I've lived in China for six months.
不好意思，让我指出先前文章的三个错误。
Excuse me, let me point out three mistakes in the above article.
我们先前不知道要怎么做，所以才求助。
We didn't know how to do it, so we asked for help.