a matter of后面名词用复数吗？

Question

a matter of后面名词用复数吗

Answer 1

in a matter of 后面用复数，表示...之内， in a matter of weeks
a matter of 如表示...的问题，可用单数或不可数名词
as a matter of fact 事实上
It is a matter of time. 时间的问题。

Answer 2

不一定吧，比如as a matter of fact，“事实上”的意思。