先行词的用法不是那么一回事
你要看先行词在从句中做什么成分.
比如this is the place that/which i told you 和 this is the place where we played together.前一句因为 place是 i told you的宾语,所以要用that引导,后面一句,place则做了 we played together的状语,而且是地点状语,所以用where.
其实要判断用that/which还是用where很简单,就看从句缺不缺成分,如果从句是个完整的句子,就用when,或where什么了~