Have you ever used this software before?
你以前用过这种软件吗？
Really, you could have told us before.
真是的，其实你大可事先跟我们说一声的。
We need more time to see how things develop before we take action.
我们采取行动以前需要有更多时间观察情况的发展。
Before I decide, I need time to reflect.
在作出决定以前，我需要时间认真考虑考虑。
Some children can read and write before they go to school.
有些孩子在上学前就会看书写字了。