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can 1.Used to indicate physical or mental ability:

能，会：用于表示身体或精神上的能力：

I can carry both suitcases. Can you remember the war?

我可以搬动两个箱子。你还能记得那场战争吗

2.Used to indicate possession of a specified power, right, or privilege:

拥有权利：用于表示拥有某种特殊权力、权利或特权，：

The President can veto congressional bills.

总统有权否决国会提案

3.Used to indicate possession of a specified capability or skill:

能力：用于表示具有某种能力或技能：

I can tune the harpsichord as well as play it.

我会弹奏大键琴，同样地，我也会给大键琴调音

4.Used to indicate possibility or probability:

可能：用于表示可能性或者或必然性：

I wonder if my long lost neighbor can still be alive. Such things can and do happen.

我怀疑我失踪已久的邻居是否还有可能活着。这样的事情可能而且确实发生了

5.Used to indicate that which is permitted, as by conscience or feelings:

允许：用于表示在意识和情感上得到允许的东西：

One can hardly blame you for being upset.

没有人会因为你受挫而责怪你

6.Used to indicate probability or possibility under the specified circumstances:

可能性：用于表示在特殊情形下的可能性或者可能的事：

They can hardly have intended to do that.

他们几乎不可能愿意做那事

7.Usage Problem Used to request or grant permission:

用法疑难 会：用于请求或给予允许：

Can I be excused?

我会得到原谅吗

may 1.To be allowed or permitted to:

许可：被允许或许可：

May I take a swim? Yes, you may.

我可以去游泳吗?是的，你可以

2.Used to indicate a certain measure of likelihood or possibility:

表可能性：用于表示可能或似乎也许的某种量度：

It may rain this afternoon.

今天下午可能会下雨

3.Used to express a desire or fervent wish:

希望：用于表达愿望、祝愿：

Long may he live!

愿他长寿!

4.Used to express contingency, purpose, or result in clauses introduced by that or so that :

能够：用于由that 或者 so that 引导的从句中，表示可能 、目的或结果：

expressing ideas so that the average person may understand.

把你的意思用一般人能听明白的话表达出来

5.To be obliged; must. Used in statutes, deeds, and other legal documents.See Usage Note at can 1

必须：有义务；必须。用于契约、证书或其他法令条款中参见 can1

must 1.To be obliged or required by morality, law, or custom:

必须：为道德良心、法律或者习惯所要求或强迫：

Citizens must register in order to vote.

为了进行选举，公民们必须登记

2.To be compelled, as by a physical necessity or requirement:

必须，必要：由于物质需要和要求而被迫：

Plants must have oxygen in order to live.

为了存活植物必须有氧气

3.Used to express a command or an admonition:

一定，必须：用来表示命令或者愿望：

You must not go there alone. You simply must be careful.

你一定不要单独去那里。你一定要小心

4.To be determined to; have as a fixed resolve:

一定：下决心一定要；坚持要：

If you must leave, do it quietly.

如果你一定要离开，那就悄悄地走

5.Used to indicate inevitability or certainty:

表示不可避免性或者可能性：

We all must die.

我们都会死

6.Used to indicate logical probability or presumptive certainty:

可能：用来表示逻辑推断的可能性或假定的必然性：

If the lights were on, they must have been at home.

如果灯亮着，那么他们一定在家

n.（名词）

1.Something that is absolutely required or indispensable:

一定，绝对：绝对必要或不可避免的应当去做之事：

Promptness on the job is a must. Comfortable shoes are a must when taking a walking tour of Wales.

工作上准时是绝对必要的。步行去威尔士旅行时舒服的鞋是绝对必要的物品

n.attributive.（定语名词）

1.Often used to modify another noun:

常用来修饰另一个名词：

a new book that is must reading; a list of must legislation for the session.

一本不可不读的新书；开庭不可缺少的立法一览表

need 1.A lack of something required or desirable:

需要：对想要或期望的事物的缺乏：

crops in need of water; a need for affection.

需要水的庄稼；对感情的需要

2.Something required or wanted; a requisite:

必需品：要求或需要的事物；需要物：

Our needs are modest.

我们的必需品是谦虚

3.Necessity; obligation:

必要；义务：

There is no need for you to go.

你没有必要去

4.A condition of poverty or misfortune:

贫困：贫穷或不幸的状况：

The family is in dire need.

这个家庭极为贫困

v.（动词）

need.ed， need.ing， needs

aux.（助词）

1.To be under the necessity of or the obligation to:

必须要：必须要，有义务要：

They need not come.

他们不必来

v.tr.（及物动词）

1.To have need of; require:

需要；想要：

The family needs money.

这个家庭需要钱

现在完成时和现在完成进行时的区别和用法

http://www.lesun.org/english/html/2005-04/3524.htm