can, may, must, 区别
1. Can (过去式could) 可表示下列三种意思：
A. (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 can make .
2) 她的表现是我们所能期望的最佳状态了。
Her was the best that could be hoped for.
B. (能力)
3) 你能解决这个问题吗？
Can you solve this ?
4) 约翰十岁就会说五种语言。
John could speak five 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 next week. (√)
I will can solve this 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. (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 of ago, women could not vote in .
2. May (过去式might) 可表示下列两种意思：
A. (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 .
10）可能有一些怨言。
There might be some .
B. (允许)
11) 如果没什么可说的，你可以走了。
You may go now if you have else to say.
12）请问你用不用计算机？
Might I ask you are using your ?
3. Must （过去式用had to)
A. (推测的必然性)
13）一定是哪里出错了。
There must be some .
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. or (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. /ought to
A. (试探性的推论)
19）我们从这应该可以看得到。
We / ought to be able to see it from here.
20）这个时候她应该到家了。
She /ought to be home at this .
B. (义务)
21）你应该照他的话做。
You /ought to what he says.
22）开会之前你应该准备周全。
You get ready the .
an, may, must, 区别
1. Can (过去式could) 可表示下列三种意思：
A. (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 can make .
2) 她的表现是我们所能期望的最佳状态了。
Her was the best that could be hoped for.
B. (能力)
3) 你能解决这个问题吗？
Can you solve this ?
4) 约翰十岁就会说五种语言。
John could speak five 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 next week. (√)
I will can solve this 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. (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 of ago, women could not vote in .
2. May (过去式might) 可表示下列两种意思：
A. (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 .
10）可能有一些怨言。
There might be some .
B. (允许)
11) 如果没什么可说的，你可以走了。
You may go now if you have else to say.
12）请问你用不用计算机？
Might I ask you are using your ?
3. Must （过去式用had to)
A. (推测的必然性)
13）一定是哪里出错了。
There must be some .
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. or (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. /ought to
A. (试探性的推论)
19）我们从这应该可以看得到。
We / ought to be able to see it from here.
20）这个时候她应该到家了。
She /ought to be home at this .
B. (义务)
21）你应该照他的话做。
You /ought to what he says.
22）开会之前你应该准备周全。
You get ready the .
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