Question

定语从句中关系代词that +be动词is时的省略

We had about long debate about what to do next中本来应是完整定语that is about what to do next，但省略了that is吗？这是什么规则呢？

Answer 1

about what to do next是介词短语作定语 ，并不是定语从句的省略。因为短语作定语与定语从句作定语是 两个 概念。不可混为一谈。否则岂不是可以把所有的作定语的词都看成定语从句的省略？如he is a good student=he is a student who is good.

Answer 2

We had about long debate about what to do next 这句话有语法问题。建议再仔细看看原文，看是否将全句列在这里了。从这句话里看不出想表达什么。