It was just about time to leave.差不多到了该走的时候了。

The work is just about done.工作差不多干完了。

That is just about the biggest horse I have ever seen. [=that is a very big horse]那几乎是我见过的最大的马。

That is just about the stupidest thing she has ever done.那差不多是她做过的最蠢的事。