Have you ever used this software before?

　　你以前用過(guò)這種軟件嗎？

　　Really, you could have told us before.

　　真是的，其實(shí)你大可事先跟我們說(shuō)一聲的。

　　We need more time to see how things develop before we take action.

　　我們采取行動(dòng)以前需要有更多時(shí)間觀察情況的發(fā)展。

　　Before I decide, I need time to reflect.

　　在作出決定以前，我需要時(shí)間認(rèn)真考慮考慮。

　　Some children can read and write before they go to school.

　　有些孩子在上學(xué)前就會(huì)看書寫字了。