永久的英语是什么(once及其常见短语)
时间: 2024-12-07 08:30:45
once可以用作副词和连词。现就其做连词和副词以及常见的五个短语进行总结。
1.once做副词表示“仅一次;一次”。比如:I've only been there once.我只去过那里一次。He cleans his car once a week.他每周洗一次汽车。
She only sees her parents once every six months.她每半年才探望一次父母。I remember meeting him once somewhere.我记得在什么地方见过他一次。
once做副词表示“曾经”。比如:He once lived in Zambia.他曾在赞比亚生活。This book was famous once, but nobody reads it today.这本书曾名噪一时,但现在却无人问津。
once表示“每隔……一次”。比如:Lung cells die and are replaced about once a week. 肺细胞约每周死亡、更新一次。
2.once作为连词可以连接复合句。其意思是“一旦……就;一旦;当……时候”。比如:
We didn't know how we would cope once the money had gone.一旦钱花光了,我们就不知道该怎么办了。The water is fine once you're in!你一旦下了水,就会觉得水里挺舒适。
The decision had taken about 10 seconds once he'd read a market research study.他读完一份市场调研报告后,10秒钟就做出了决定。
3.由once构成的常见短语有all at once、at once、once more等五个短语,它们也在试卷中常常出现的。
* all at once指“突然,骤然,忽然” 。比如:All at once there was someone knocking on the door.突然有人敲门。All at once she lost her temper.她突然大发脾气。
*at once有两个常见意思:“立即,马上;同时”。比如:Come here at once!马上到这里来!I have to go at once.我得马上走。
I can't do two things at once.我不能同时做两件事。Don't all speak at once!大家不要同时讲!
*once(and)for all意思是“一劳永逸地,永久地”。比如:We have to resolve this matter once and for all.我们必须彻底解决这件事情。
The days when we had to import oil are gone once and for all.我们不得不进口石油的日子已一去不复返了。
*once more(once again)意思是“再一次”。比如:
Once again the train was late.火车又一次晚点了。Let me hear it just once more. 让我再听一遍。I hit him once more for luck.我无故又打了他一下。
*once in a while指“偶尔;有时”。比如:He comes to our room for a chat every once in a while.他偶尔来我们房中闲谈。
Your body, like any other machine, needs a full service once in a while.你的身体就像其他机器一样,偶尔也需要一次全面保养。