can与could的区别Would John attend the meeting if he __________ A.wouldn'tB.couldC.canD.can'tcan 表示的可能性比 could 大一些,那用can也可以啊

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can与could的区别Would John attend the meeting if he __________ A.wouldn'tB.couldC.canD.can'tcan 表示的可能性比 could 大一些,那用can也可以啊
can与could的区别
Would John attend the meeting if he __________
A.wouldn't
B.could
C.can
D.can't
can 表示的可能性比 could 大一些,那用can也可以啊

can与could的区别Would John attend the meeting if he __________ A.wouldn'tB.couldC.canD.can'tcan 表示的可能性比 could 大一些,那用can也可以啊
can 和 could 表示三种意思,后者是前者的过去形式,但是却不见得总是表示过去,具体用法如下:
1.表示“能力”,相当于汉语的“能够、可以、得以”等意思,在这种情况下,can 用于现在时态,could 用于过去时态,如:
1)表示现在:
I can carry both suitcases.
我可以搬动两个箱子.
Can you remember the war?
你还能记得那场战争吗
2)表示过去:
We could see the oil bleeding out from the joint.
(那时)我们可以看出油从接缝处渗出.
It was so dark that we could see nothing.
(当时)天太暗了,我们什么也看不见.
2.表示“猜测”,相当于汉语的“有可能”,一般不分时态,只不过 can 表示的可能性比 could 大一些,如:
I wonder if my long lost neighbor can/could still be alive.
我怀疑我失踪已久的邻居是否还有可能活着.
Such things can/could and do happen.
这样的事情可能而且确实发生了.
但是用于虚拟语气表示相反的假设时,只能用 could,如:
If I could go with you,I should feel very glad.
假如我能同你们一起去,我会感到非常高兴.
You could have been more considerate.
你本来可以更慎重些.
3.在口语中用来取代 may 以缓和“允许”的强硬语气,could 比 can 语气更加委婉,如:
Can/could I borrow your thermos?
我可以借用你的暖水瓶吗?
你的选择题 Would John attend the meeting if he __________ 就是表示有可能的虚拟语气,所以只能选择 B.could.

B. could
can 与 be able to 都可以表示能力,但两者在用法上有点差异:can (could)表示主观能力,不表示意愿,它的将来时用will be able to; be able to表示主观意愿,强调要克服困难去做某事。例如:
1)My grandma is over seventy, but she can still read without glas...

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B. could
can 与 be able to 都可以表示能力,但两者在用法上有点差异:can (could)表示主观能力,不表示意愿,它的将来时用will be able to; be able to表示主观意愿,强调要克服困难去做某事。例如:
1)My grandma is over seventy, but she can still read without glasses.
2)He is able to give up his bad habits.
注意:could不表示时态
1)提出委婉的请求,(注意在回答中不可用could)。
--- Could I have the television on?
--- Yes, you can. / No, you can't.
2)在否定,疑问句中表示推测或怀疑。
He couldn't be a bad man.
他不大可能是坏人。

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