- 你以前可以从这里看到教堂。
You used to be able to see the church from here.
- 以前从来没有人听说过。
Nobody had ever heard of it.
- 我以前读过这本书。
I have read the book before.
- 这幢楼以前是医院。
Formerly this building was a hospital.
- 因为以前见过他， 所以我立刻就认出他来。
Having met him before, I recognized him at once.
- 你以前应该听过这个故事。
You will have heard this story before.
- 以前人们以为只有人类才懂得用语言沟通。
People used to think that only humans could use language.
- 以前的人以为地球是平的。
It was believed that the earth was flat.
- 以前的人以为地球是平的。
It used to be thought that the earth was flat.
- Johny以前是个化学家，但现在Johny不再是了。他以前所想的是水，是硫酸。
Johny was a chemist; now Johny is no more. For what he thought was water, was H2SO4.
