When Spain colonized the Philippines, they were administrated by Mexico City. So it was Mexican Spanish, not Castilian Spanish, that influenced Tagalog.
他不知道该怎么做,于是便找我帮忙。
Not knowing what to do, he asked me for help.
由于是用简单的英语所写的,这本书很容易阅读。
As it is written in simple English, this book is easy to read.