以前，门诺教徒不用交税，他们开办自己的学校，拥有自己的警察。
The Mennonites, who until recently paid no taxes, run their own schools and police.
不用担心，以前的主题依然存在。
现在这里的一切和以前一样。不用担心我。
Things here are the same now as they were before. Don't worry about me.
你为什么不用这台？这是我以前的男朋友送我的。
这条路线旅行的人以前常走，但是现在已不用了。
The route was once much travelled but has fallen into disuse.
因为她结婚了，她不用再像以前那样地工作。
Because she's married, she doesn't have to work like before.
两个人来到我的办公室，我以前从未见过他们。在介词后面不用。
Two men, neither of whom I had ever seen before, came into my office.
两个人来到我的办公室，我以前从未见过他们。在介词后面不用。
Two men, neither of whom I had ever seen before, came into my office.
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