Question

这个为什么是定语从句? This is the first time [that] I have been here.

xiexie le ~

Answer 1

这就是定语从句。不过是有点特殊。
当先行词有time,day,place,reason,way等的时候，可以用that代替when或where或why或介词+which, 口语中that 还可以省略。

比如：

I still remember the day (that) you went away
I still remember the day on which you went away
I still remember the day when you went away

I still remember the place (that) you once lived
I still remember the place in which you once lived
I still remember the place where you once lived

The reason (that) he was chosen remains unknown. 口语中that可以不要
The reason for which he was chosen remains unknown.
The reason why he was chosen remains unknown

Answer 2

这不是定语从句，是同位语从句，是对first
time的进一步说明
定语从句中that作引导词，that在从句中或充当主语，或充当宾语，而同位语从句的that只起到连接的作用，不充当任何成分
这个句子中
i
have
been
here
主语和谓语都有，是一个完整的句子，所以它是一个同位语从句
同位语从句
不用when连接
定语从句中，假如先行词是充当时间状语，才用when作为引导词

Answer 3

这个不是定语从句啊，这里的This指代的就是that后面引导的句子，this是形式主语。。。真正的主语是that i have been here。。。。。就像It's the first time that×××一样啊。。。。

Answer 4

..就这么说吧，般名词后边有that什么的就是定语从句
翻译一般是
...的....
在这里就是【我来这里后】的【第一次】

Answer 5

不是定语从句吧，应该是强调句。