定语从句怎么看。定语从句一定是不完整么？

Question

如题所述

Answer 1

定语从句由关系代词作引导词时，从句是不完整的。
The house （that/which） they visited yesterday is very beautiful.
they visited yesterday少了宾语。
定语从句由关系副词作引导词时或介词+which/whom/whose引导时，从句是完整的。
The house where they live is very beautiful.
they live结构完整。追问

那定语从句如果是that连接的，后面的句子一定不完整么？that只能表示关系代词么？

追答

是的。定语从句引导词that就是关系代词，句子就不完整，因为that充当了其中成分。