I'm going to Lisa's house to play you should call her before goes there 為何下句用goes，而不是用go? 我看書上寫的，主要子句若是未來式，副詞子句就要用現在式，下句的主詞不是you嗎?

錯誤的，應該寫before you go，或call her first

In this pattern the predicative adjunct is a present participle(=go---->going)
You should call her-------Subject +vt
before going there--------present participle
=going after call
going=present participle. It is an error to use "goes".as the S is "You".