高考中遇到下面的几个先行词你知道用什么词来引导定语从句吗？来看看吧！
1.先行词是reason时:
(1)在reason作先行词的定语从句中，若从句表原因，一般用why引导定语从句，why可以用for which,that替换。why还可省去。
The reason( why /for which/that) he has resigned is poor health.他辞职的理由是健康状况不佳。
(2)当reason作主语带有定语从句修饰时，其后的表语从句通常用that不用because。
The reason why he didn’t come in time was that he didn’t feel well.
他没有来的原因是因为他不舒服。
(3)当reason用作定语从句的宾语时，引导词用that/which,而且that/which可省去。
The reason (that/which) he gave for being late was that they were held up in a traffic jam.
他给出的迟到原因是由于他们被交通阻塞给耽误了。
2.先行词是the way时：
the way后面的定语从句，关系词若在从句中作状语，相当于“用这种方式 / 方法(=in this way)”时，通常不用关系词，偶尔用that，在较正式的文体里用in which来引导。如：
Do it the way you were taught. 要照教你的那样做。
I was impressed by the way in which she did it. 她干成这件事的方式给我留下了深刻的印象。
注意：way 后不能用 how 引导定语从句，但也可以不用 way，而直接用 how 引导的名词性从句来表达这类意思。如：
That’s the way he did it.= That’s how he did it. 他就是这样做的。
另外，当先行词way表示方向时，不用任何关系词。如：
Was that the way she went? 她是往那个方向走的吗？
3.先行词是time时：
①当先行词为 by the time ,any time , the way, every time, the first time ,the last time 时，关系词不用when而用that.或省略。
By the time when you arrived in London, we had stayed there for two weeks.
到你到达伦敦的时候，我们在那里已经待了两个星期。
I still remember the first time when I met her.
我仍然记得我第一次见到她。
Each time when he goes to business trip, he brings a lot of living necessities, such as towels, soap, toothbrush etc。
每一次他去出差，他带来了生活必需品，如毛巾，肥皂，牙刷等，很多。
②在定语从句中,time 有很多意思，当表示一段时间用关系副词when,或者at/during which引导定语从句。若表示次数应用that，也可以省略。
比如: I miss the time when we were together.
It’s the second time that I have seen the picture.（注：从句用完成时）
第一句中time表示"一段时间",第二句time就表示"次"。
③It is (high) time that 后面的从句谓语动词要用过去式或用should加动词原形。
It is time that the children went to bed.
It is high time that the children should go to bed.