may be和can和must和could的区别？
管理员
may be 的中文意思是也许，大概，他表示很大的几率性，can 的意思是可以，他是百分百的概率，must 中文意思是必须,包含强硬的命令口吻,也是属于要百分百执行的,could 与can 存在一些细微的差别,他是can 的过去时态,但意思与can一样，都表示百分百的几率。
管理员
should，would，could，must，might，may，can的区别：
1、can (could)表示能力，could主要指过去时间。表惊异、怀疑、不相信等态度。主要用于否定句、疑问句或感叹句中。
2、may (might)表允许，might可以指过去时间，也可指现在时间，语气更委婉。在回答以may引起的问句时，多避免用这个词，而用其它方式，如Yes, please. / Certainly.表可能（事实上）。可以指过去时间，也可以指现在时间，但语气更加不肯定。
3、must表示义务。意为“必须”（主观意志）。表示揣测。意为“想必、准是、一定”等，只用于肯定句。
4、 shall表征询意见，用于第一、第三人称疑问句。表说话人的意愿，有“命令、允诺、警告、决心”等意思，用于第二、第三人称陈述句。
5、will表意愿，用于各种人称陈述句。表请求，用于疑问句。表示某种倾向或习惯性动作。
6、should表义务。意为“应该”（某件事宜于做），用于各种人称。表推测，意为“想必一定、照说应该、估计”等。
7、would表意愿，表委婉地提出请求、建议或看法。表过去反复发生的动作或过去的一种倾向。
拓展资料
should
1、I should exercise more
我应该多锻炼一些。
2、All visitors should register with the British Embassy
所有游客都必须到英国大使馆登记。
3、I should have gone this morning but I was feeling a bit ill
今天早晨我本应该走的，但是我觉得有点不舒服。
4、You should have no problem with reading this language
阅读这种语言你应该没问题。
5、Should I or shouldn't I go to university?
我该不该去上大学呢？
would
1、No one believed he would actually kill himself
没有人相信他真的会自杀。
2、The statement added that although there were a number of differing views, these would be discussed by both sides
这项声明还称，虽然双方观点存在若干分歧，但将就这些分歧展开讨论。
3、Ordinarily it would be fun to be taken to fabulous restaurants
一般来说，跟别人去豪华餐馆吃饭会是件乐事。
4、They said they would give the police their full cooperation
他们说他们愿意与警方通力合作。
5、She asked me what I would like to do and mentioned a particular job
她问我想干什么，然后提到了一份工作。
could
1、For my return journey, I felt I could afford the extra and travel first class
至于回程，我觉得我能多花点钱坐头等舱。
2、Though he had a temper and could be nasty, it never lasted
虽然他爱发脾气，而且有时还很讨厌，但向来都只是一阵儿。
3、He could have made a fortune as a lawyer
他本可以当律师挣大钱的。
4、Doctors told him the disease could have been caused by years of working in smokey clubs
医生们告诉他这种疾病可能是由于多年在烟雾缭绕的俱乐部工作所致。
5、Their hope was that a new and better East Germany could be born
他们希望能够诞生一个崭新的、更加美好的东德。
管理员
can, may, must, should区别
1. Can (过去式could) 可表示下列三种意思：
A. possibility (可能性) （表示理性的猜测，与事实村子与否无关。）
1) 专家也可能犯错。
Even experts can make mistakes.
2) 她的表现是我们所能期望的最佳状态了。
Her performance was the best that couldbe hoped for.
B. Ability (能力)
3) 你能解决这个问题吗？
Can you solve this problem?
4) 约翰十岁就会说五种语言。
John could speak five languages by the age of ten.
5) 下星期我就能解决这个问题
I will be able to solve this problem next week. (√)
I will can solve this problem next week. ( ×)
6) 事情总会水落石出的。
The truth will be found out. (√ )
The truth can be found out. (× )
C. permission (允许)
7）我可以用你的电话吗？
Can I use your phone?
8）二十年前妇女在选举时不能投票。
A couple of decades ago, women couldnot vote in elections.
2. May (过去式might) 可表示下列两种意思：
A. possibility (可能性) （表示推测可能存在的事实）
9）我们可能永远到不了山顶。
We may never reach the top of the mountain.
10）可能有一些怨言。
There might be some complaints.
B. permission (允许)
11) 如果没什么可说的，你可以走了。
You may go now if you have nothing else to say.
12）请问你用不用计算机？
Might I ask whether you are using your computer?
3. Must （过去式用had to)
A. Logical necessity (推测的必然性)
13）一定是哪里出错了。
There must be some mistakes.
14）他一定很有钱。
He must have a lot of money.
15) 一定得弄出那么大的声音吗？
Need they make so much noise? (√)
Do they need to/have to make so much noise? (√)
Must you make so much noise? (×)
16）他们一定得弄出那么大的声音。
They will have to make a lot of noise. (√)
They will must make so much noise. (×)
B. Obligation or compulsion (义务或强制)
17）晚上十点一定要回来。
You must be back by ten p.m.
18）晚上十点一定要回来吗？
Need she be back by ten p.m.? (√)
Does she need to/have to be back by ten p.m.? (√)
Must she be back by ten p.m.? (×)
4. should /ought to
A. tentative inference (试探性的推论)
19）我们从这应该可以看得到。
We should/ ought to be able to see it from here.
20）这个时候她应该到家了。
She should/ought to be home at this moment.
B. obligation (义务)
21）你应该照他的话做。
You should/ought to follow what he says.
22）开会之前你应该准备周全。
You should get ready before attending the meeting.
an, may, must, should区别
1. Can (过去式could) 可表示下列三种意思：
A. possibility (可能性) （表示理性的猜测，与事实村子与否无关。）
1) 专家也可能犯错。
Even experts can make mistakes.
2) 她的表现是我们所能期望的最佳状态了。
Her performance was the best that couldbe hoped for.
B. Ability (能力)
3) 你能解决这个问题吗？
Can you solve this problem?
4) 约翰十岁就会说五种语言。
John could speak five languages by the age of ten.
5) 下星期我就能解决这个问题
I will be able to solve this problem next week. (√)
I will can solve this problem next week. ( ×)
6) 事情总会水落石出的。
The truth will be found out. (√ )
The truth can be found out. (× )
C. permission (允许)
7）我可以用你的电话吗？
Can I use your phone?
8）二十年前妇女在选举时不能投票。
A couple of decades ago, women couldnot vote in elections.
2. May (过去式might) 可表示下列两种意思：
A. possibility (可能性) （表示推测可能存在的事实）
9）我们可能永远到不了山顶。
We may never reach the top of the mountain.
10）可能有一些怨言。
There might be some complaints.
B. permission (允许)
11) 如果没什么可说的，你可以走了。
You may go now if you have nothing else to say.
12）请问你用不用计算机？
Might I ask whether you are using your computer?
3. Must （过去式用had to)
A. Logical necessity (推测的必然性)
13）一定是哪里出错了。
There must be some mistakes.
14）他一定很有钱。
He must have a lot of money.
15) 一定得弄出那么大的声音吗？
Need they make so much noise? (√)
Do they need to/have to make so much noise? (√)
Must you make so much noise? (×)
16）他们一定得弄出那么大的声音。
They will have to make a lot of noise. (√)
They will must make so much noise. (×)
B. Obligation or compulsion (义务或强制)
17）晚上十点一定要回来。
You must be back by ten p.m.
18）晚上十点一定要回来吗？
Need she be back by ten p.m.? (√)
Does she need to/have to be back by ten p.m.? (√)
Must she be back by ten p.m.? (×)
4. should /ought to
A. tentative inference (试探性的推论)
19）我们从这应该可以看得到。
We should/ ought to be able to see it from here.
20）这个时候她应该到家了。
She should/ought to be home at this moment.
B. obligation (义务)
21）你应该照他的话做。
You should/ought to follow what he says.
22）开会之前你应该准备周全。
You should get ready before attending the meeting.