1.关系副词也可以引导定语从句
关系副词在从句中分别表示时间.地点或原因。关系副词when在从句中充当时间状语，where 充当地点状语，why充当原因状语。
2. that可引导定语从句表示时间.地点或原因
That有时可以代替关系副词 when, where 或者why引导定语从句表示时间.地点或原因，在 that引导的这种定语从句中，that也可以省去。
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