zhè / jiàn / shì / wǒ / yǐ / qián / bāng / guò / tā / suǒ / yǐ / zhī / dào / gāi / zěn / me / chǔ / lǐ

这件事我以前帮过他，所以知道该怎么处理。

I have helped him with this before, so I know how to handle it.