也可以说:You had tutored me in my spoken English before you went to Beijing.
意思是一样的。
在before和after引导的
时间状语从句中,时态用不用
过去完成时都行,因为before和after已经表明了动作的先后。
但是,when从句就可用过去完成时表达动作先后了。
如
He went shopping after he (had) finished his homework.他做完作业后去购物了。
The film had begun when I went into the cinema.当我走进电影院时,电影已经开始了。