據我所知,xxxx

據我所知，意思是”就我所知”
英文是：As far as I know，或so far as I know
如Cambridge Dictionary就有一例：He isn，t coming today, as far as I know（就我所知，他今天不會來）
As far as其實非常好用，如：
As far as I am concerned就我而言
As far as I can tell　我所能說的．．．
等等，多用這些子句，作文時看起來也像個外國人

係咪
According to my knowledge,xxxxx

As far as I understand, ......

According to my past experience,....