博瑞生物医药:英语高手,请进!!!!!!!!!

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1.谁能告诉我can,may,must,need的区别和用法?
2.现在完成时和现在完成进行时的区别和用法?
多谢了!!!!!!

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

can是能够的意思,may是可能,must是必需,need是需要,must语气最强烈,现在完成时是过去持续到现在仍在发生的事情,或对现在依然有影响\现在完成进行时是过去持续到现在一直在做没有停止的事

http://www.hongen.com/eng/pub/yufac/
这个网站不错

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

上面那些都是金山词霸里的,看了也白看,让我告诉你!
can 适用于疑问句,一般是can I help you? Can you give me .....?等(情态动词)还可翻译成能,=be able to 但是,不能说成是can be able to 他的过去式是could,语气更加委婉。
need 的用法多。
1.need to do sth.
eg.I need to finish the homework at once.
2.need doing 表被动
The bike needs mending.(一般是现在时)
3.in a great need of 需要
I'm in a great need of eating cakes.
4.need do sth.(情态动词)
5.need 的否定是needn't ,didn't ,don't,doesn't
must 表必须,表推测
eg.Must I finish the homework right now?
回答可以是:No,you needn't.Yes,you must.
must do sth
may
1.may do sth.
2.maybe 与 may be 的区别
eg.Maybe Mr Li know the answer.
Mr Li may be the last person that left.
3.may 的过去式是might 更婉转
以上都为我这个初三学生总结,谢谢!
现完与现完进的区别需要你用做题来领悟,多问问老师!看看语法书!

can,may,must,need
是英文学习中只能慢慢学习来意会的东西,
单纯地用汉字进行意思地描述是失之偏颇的。
建议多多通过例句来反复体会这其中地细微差别。
英语学习也是一个熟悉、理解的过程。