高二英语语法讲解：关于定语从句的三个问答
问：that可以用作关系副词吗?答：that引导定语从句，除了用作关系代词外，也可用作关系副词。这种用法见于下面两种情况：
①先行词是表示时间的名词时，可用that 代替when引导定语从句，that也可以省略。例如：
I left the day that she came. 她来的那天，我走了。
He was my good friend during the years that I was in the countryside.他是我在农村时期的好朋友。
It’s time (that) we went to bed.是我们就寝的时候了。
②先行词是表示原因或方式的名词时，that相当于介词+which，可以引导的定语从句，that也可以省略。例如：
She likes the child for the very reason that (=for which) she loves his father. 她喜欢那孩子的原因是正是她爱他的父亲的原因。
He didn’t like the way that (=in which) she speaks to his mother. 他不喜欢她对他的母亲那样说话。
Imagine the speed that (=at which) he drives the car. 很难想象，他开车开得那么快。
The reason (that /for which /why) he came here was to ask for our help.他来这里的原因是寻求我们的帮助。
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