在限制性定语从句中 有时 可以用that 代替关系副词when where why 引导定语从句 这种用法的that 也可以 省略 .
所以
The reason why I have to go
=The reason for which I have to go
=The reason that I have to go
=The reason I have to go
类似例子
the way in which i study english
=the way that i study english
=the way i study english
关系副词that的用法
that只能引导限制性定语从句,充当关系副词时,其作用相当于：“介词+关系代词”,在从句中充当时间、地点、方式、原因状语等.
如：1. 在定语从句中作时间状语.现行词有：each time, every time, anytime, the first time, the moment, the minute, the hour, etc. 但现代英语中,that往往省略.
如：Each time (that) I meet him, he will smile and say “hello”. 每次我会见他时,他都会笑着说“喂,你好!”
2. 在定语从句中作方式状语, 现行词是way, 如：Can you show me the way (that) you solve the problem like this? 请告诉我你解决这类问题的方法好吗?
3. 在定语从句中作原因状语,现行词只有reason一词
,如：I don’t know the reason (that) he has left school now. 我不知道他辍学的原因.
4. 在定语从句中做其他状语,现行词如price, speed等,
如：I think the price (that) she sells her apple is too high. (that = at which) 我认为她卖苹果的价格太高.
追问谢谢
不好意思，没采纳你
追答没关系，只要能帮到你 我就开心
追问谢谢