before和by的时态

回答

爱扬教育

2022-04-03

before和by的时态是过去完成时。
before：prep.之前;在…以前;在…面前(或前面);(次序或排列)在前面。
by：adv.通过;经过;表示保留或保存时用;短暂拜访。

扩展资料

　　Day care is provided by the company she works for.

　　她工作的那家公司有日托。

　　All the statistical computations were performed by the new software system.

　　所有的统计计算均由新的软件系统完成。

　　They won by a single goal after extra time.

　　他们在加时赛中仅踢进一球即获胜。

　　They've increased the price by 50%.

　　他们已经把价格提高了50%。

　　Now I can walk to work instead of going by car.

　　现在我可以步行去上班，而不必开车了。