once的用法总结【优秀4篇】

时间:2023-03-26 16:16:47 | 文章来源:职结果

once的用法 篇一

once具有副词,连词和名词等用法,名词一般表示一次,一回等意思,而副词和连词的用法比较多,具体如下:

1. 用作副词,表示“一次”,是频度状语,通常放在句末,有时也放在句首。如:

I’ll help you once but then you must do it by yourself. 我只帮你一次,但以后你就得自己做了。

Once he made bold to ask her to accompany him to a party. 有一次他鼓起勇气要求她陪他去参加一个晚会。

表示“曾经”“一度”,是表示不确定时间的副词,通常放在行为动词之前,特殊动词(助动词、情态动词、动词 be)之后,有时也可放在句首。如:

Once there stood an old church on the hill. 山丘上曾经有一座古教堂。

This novel was once very popular but nobody reads it today. 这本小说曾经很受欢迎,但现在没有人读了。

表示“一次”的once还经常与 a, every 等连用。如:

This magazine comes out once a week. 这份杂志每周出一次。

The earth turns on its axis once every 24 hours. 地球每24小时自转一圈。

2. 用作连词,引导时间状语从句,注意从句要用现在时表示将来意义。如:

Once you let him start talking, there was no stopping him. 一旦让他开始讲话,就没法止住他。

Once you have learned Spanish, you will find Italian easy. 一旦你学会西班牙语,你会觉得意大利语容易。

所引导从句的主语若与主句主语一致,有时也可用其省略结构,被省略部分通常(并不总是)包括有动词 be。如:

Once (it is) printed, the book will be very popular. 一旦出版,这本书会大受欢迎。

Once having made a promise, you should keep it. 你一旦许下诺言,就该遵守。

Once (he was) in the examination hall, he forgot about all this. 他一进考场,这一切他都忘了。

3. 比较 at once 与 all at once:前者表示“马上”,后者表示“突然”。如:

If you don’t start at once you’ll be late. 除非你立即动身,否则你就会迟到。

All at once, we heard a loud noise. 猛然间我们听到了一声巨响。

另外,两者都可表示“同时”“一起”。比较:

I can’t do two things at once. 我不能同时做两件事。

Everybody started speaking all at once. 大家同时开始说起来。

once的用法例句 篇二

1. It had once been the home of a wealthy nobleman.

这里曾是一个有钱贵族的宅邸。

2. We tend to meet up for lunch once a week.

我们往往每周共进一次午餐。

3. He once told an interviewer that he didn't even like rock music.

他曾告诉一位采访者,他甚至都不喜欢摇滚乐。

4. Once wholesale prices are deregulated, consumer prices will also rise.

一旦批发价格放开,零售价格也会随之上涨。

5. He took off at once and headed back to the motel.

他立刻离开,回到汽车旅馆。

6. The car passed over the body twice, once backward and then forward.

那辆车把那人来回轧了两次,先是倒着轧的,再是往前开着轧的。

once的意思 篇三

adv. 一次,一趟;一倍;曾经;一旦

conj. 一旦…就…;一经;

n. 一次,一回;

once相关短语 篇四

一、详细释义:

phr.

立刻,马上

例句:

Let's pack up and start at once.

让我们整理好行李立刻出发。

例句:

He attacked the difficulties at once.

他立即着手解决这些困难。

同时,一起

例句:

He has the faculty of doing two things at once.

他有同时做两件事的能力。

例句:

Bill can play the violin and dance all at once.

比尔可以在拉小提琴的同时跳舞。

二、词义辨析:

immediately,instantly,presently,directly,shortly,soon,at once,right away

这些副词或副词词组均有“立刻,马上”之意。 immediately指做完一件事后,立即就做另一件事,中间一般没有明显的时间间隔。 instantly指恰恰就在此刻,一秒钟也没耽误。 presently指不久、即将。 directly和immediately同义,指毫无迟疑。 shortly和soon同义,指动作发生或完成的速度之快。 soon常用词,指行动快,完成速度快。 at once口语中常用,语气强烈,指时间紧迫,一刻也不能耽误。 right away主要用于美国英语,语气稍弱于at once,强调动作迅速。

三、参考例句:

All at once Phil disappeared.

菲尔突然不见了。

At once I heard a soft purr.

立刻,我听到一阵温柔的咕噜声。

The place at once enraptured me.

那个地方一下子把我迷住了。

We agreed to leave at once.

我们同意立即离开。

Get off that bed at once!

马上离开那张床!

I'm leaving for Rome at once.

我马上就去罗马。

She began at once to unburden her feelings.

她立刻开始发泄她的感情。

I can juggle with three balls at once!

我能同时耍3个球!

All at once, a rabbit came out of a hole.

突然,一只兔子从一个洞中跑了出来。

All at once he seemed to lose control of himself.

他仿佛下子沉不住气了。

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