despite和in spite of 后面都接名词性成分 如名词、动名词、名词性从句 用法基本一致 但他们后面接句子一般用despite/in spite of the fact that 的结构 that后是同位语从句 这样比较正式
English became the official language in spite of/despite the fact that the population is largely chinese.
despite of不要用 据说是古用法 现在有考试算错误
be about to 就是将要做某事 I was just about to ask you the same thing. 后面接时间状语从句一般用when， be about to 表示一个时间点 不好用延续性动作 而瞬时动作一般用when引导