(1) ①ever意为“在任何时候/场合/情况下”，有时相当于汉语的“曾经”，与never互为反义词。
- A: Come and see me if you are ever in London.
如果你到伦敦，记得来看我。 - B: No, I'm afraid I never go there.
不，我怕是永远去不了那里。
②ever多用于疑问句、否定句及带if(表示条件)和含有否定意味的词，如hardly, stop等的肯定句中。
- A: Have you ever been there?
你曾到过那里吗？ - B: Yes, I have been there once.
是的，我到过一次。 - Nothing ever happened here.
这里什么事也没发生过。 - I'm going to stop her ever doing that again.
我要阻止她再做那件事。
③ever可与not连用(如：I haven't ever been there.)，但通常用never代替not ever。
- I've never been there.
我从未去过那儿。
④ever用于比较级 + than 之后，强化比较级。
- You're looking lovelier than ever .
你比以前任何时候看上去都漂亮。
⑤ever用在比较级前，强化比较级。
- This truth is being accepted by ever broader masses.
这一真理正在被更为广大的群众所接受。
⑥ever可强化有比较意味的as...as结构。
- Work as hard as ever you can.
尽最大努力干吧。 - He ran as fast as ever he could.
他跑得尽可能地快。
⑦ever用于最高级时，等于ever known。
- It's the nicest thing ever .
这是目前所知的最好的东西。
⑧ever用于一般肯定句，意为“一直地，总是，永远”，比always意味稍强。
- They were very happy ever afterwards.(故事结尾)
以后他们一直幸福地生活着。 - Tom repeated ever the same words.
汤姆一直重复同样的话。
⑨有时ever用于古风较浓的句子。
- It has ever been so, and ever will be so.
一向就是如此，将来也会是如此。
⑩ever可与what, who, when, where, how, why等合用，以加强语气，译为“到底，究竟”，近似于at all。
- What ever do you want?
你到底想要什么？ - Who ever can it be?
那究竟是谁？ - How ever did I forget it?
我怎么把它忘了? - Why ever didn't you say so?
你当时究竟为什么不这样说呢? - ⑪ever在句中也可后移。
- How did I ever forget it?
我怎么竟把它忘了? - Why didn't you ever say so?
你当时究竟为什么不这样说呢?
ever可以组成俗语as ever is/was，意为“实实在在地”；for ever (and ever)意为“永远地”。
- I was fifty-five as ever was this very spring.
就在今年春天，我正好满55岁。 - We'll remain your friends for ever and ever .
我们将永远是你的朋友。 - He has been as good a boy as ever was .
他实在是个好小伙子。
ever与since, after连用，意为“自从……；从那以后(就一直……)”。
- I have been teaching ever since I came here.
自从来这里以后，我一直从事教学工作。 - They married and were happy ever after .
他们结了婚，自那以后一直很幸福。
(2) always意为“在一切时候，永远，总是，一向”，相当于at all times, on all occasions。
①句中只有一个动词时，always放在动词前。(另见“always, all ways”条)
- He always works hard.
他一向工作努力。 - The sun always rises in the east.
太阳永远从东方升起。
②句中有be或助动词时，always 放在其后。
- Be always loyal to the people.
永远忠于人民。 - I will always remember you.
我永远不会忘记你。
③always也可放在be前，以加强语气。
- He always is here.
他的确常在这儿。(别人以为他不在这儿) - He is always here.
他总在这儿。
④always在口语中修饰动词进行式时，往往含有感情色彩，常表示厌烦、不满、赞许等情绪。
- He is always finding fault with others.
他老是挑剔别人的毛病。 - He is always thinking of others.
他总是为别人着想。
⑤短语for always等于for ever (and ever)(永远地)。
- Last year he gave me a complete set of Lu Xun's works for always .
去年他把一套《鲁迅全集》永远地给了我。
(3) ①once可表示“过去(有一次)，曾经，一度”。
- Once they had gone to see a film, Chaplin in “The Gold Rush”.
有一次，他们去看了卓别林演的电影《淘金记》。 - I've had that same criticism passed on me once before.
以前，我也曾一度受到过同样的批评。
②once可组成短语： once and for all (=once and forever)一劳永逸地；once in a while (way)偶尔、隔些时候；for once (for this once)(至少) 这一次。
- We must take measures to put an end to that sort of things once and for all/forever .
我们必须采取措施永远杜绝那类事情。 - We shall settle the question now, once and for all .
我们现在将一劳永逸地解决这一问题。 - I don't drink wine as a rule, but I don't mind a glass once in a while/once in a way .
我通常不喝酒，但偶尔喝上一杯也可以。 - Do let me stay up later tonight, mummy — just for this once .
今天晚上让我多熬会儿夜吧，妈咪——就这一次。 - For once Brown, the most solid of men, was asking for support.
这一回，布朗，这个最坚强的汉子，也请求援助了。
