We've got to finish the foundations before the ground freezes.

　　一定要在上凍以前把地基打好。

　　Have you given up drinking whisky before breakfast?

　　你在早餐以前已不喝威士忌酒了嗎？

　　It's difficult for them to get here much before seven.

　　他們很難在7點(diǎn)以前早早地來到這里。

　　Before I decide, I need time to reflect.

　　在作出決定以前，我需要時間認(rèn)真考慮考慮。

　　You must get home before curfew.

　　你必須在實(shí)行宵禁以前回到家中。

　　He wanted to be over the line of the ridge before the sun had risen.

　　他想在太陽升起以前翻過山脊。

　　She worked a spell as a teacher before becoming a civil servant.

　　在成為公務(wù)員以前她當(dāng)過一陣?yán)蠋煛?/p>