定语从句I got a pen that doesn't work.

问题描述:

定语从句I got a pen that doesn't work.
I got a pen that doesn't work.
这个句子中 that doesn't work.是正确的定语从句吗?
that doesn't work是省略了主语,还是主语是that?
在这个问题上,(that doesn't work是省略了主语,还是主语是that?)我觉得这
个句子有点特点,但说不出来是什么,请教大家~

that doesn’t work是正确的定语从句,这个从句不是省略了主语,而是that这个关系代词已经代替先行词pen在从句里作主语了.这个句子没什么特点,就是一般的先行词在从句里作主语的定语从句.