can的用法(最新整理)

1、can 的用法：1) 表能力can 表能力时意味着凭体力或脑力或技术等可以无甚阻力地去做某事。i can climb this pole. 我能爬这根杆子。he is only four , but he can read. 他只有 4 岁，但已认得字了。fire cant destroy gold. 火烧不毁金子。因为 can 不能和其他助动词连用，所以表示将来式时用 will be able to you will be able to skate after you have practiced it two or three times. 你练习两三次后就会溜冰了。2) 表可能性多用于

2、否定与疑问结构中，但也可用在肯定句中。can the news be true? 这消息可能是真的吗？it cant be true. 它不可能是真的。what can he possibly mean? 他可能是什么意思？can 用在肯定句中表示理论上的可能性。the road can be blocked. 这条路可能会不通的。may 在肯定句中表示现实的可能性。the road may be blocked. 这条路可能不通了。3)表示允许（和 may 意思相近）常见于口语。can (may) i come in ? 我能进来吗？can i smoke here ? 我可以在这里抽烟吗？

3、could 的用法1) 表过去的可能和许可，（多用于间接引语中） at that time we thought the story could not be true. 那时我们认为所说的事不可能是真的。father said i could swim in the river.爸爸说我可以在河里游泳。2) 表过去的能力i could swim when i was only six.我刚六岁就能游泳。could 在肯定句中表示过去的能力时，常表抽象的一般的能力。he could be very naughty when a child.他小时候会是很顽皮的。如表具体做某一件事的能力时，则须

4、用 were/was able to . he was able to translate the article without a dictionary.他可以不用词典翻译那篇文章。3) could 加完成式用于肯定句时一般表过去可能完成而却未完成的动作。i could have passed my examination easily but i made too many stupid mistakes.我本可以轻易通过考试，但我犯了太多不该犯的错误。二、 may, might1) 表示请求和允许。might 比 may 语气更委婉，而不是过去式。否定回答时可用 cant或 mustn

5、t，表示“不可以，禁止”。-might/ may i smoke in this room?- no, you mustnt.- may/might i take this book out of the room?- yes, you can. (no, you cant / mustnt. )用 may i.？征徇对方许可时比较正式和客气，而用 can i.？在口语中更常见。2）用于祈使句，表示祝愿。may you succeed!3) 表示推测、可能性（不用于疑问句）。might 不是过去式，它所表示的可能性比 may 小。1. he may /might be very busy no

6、w.2. your mother may /might not know the truth.三、 must, have to1) 表示必须、必要。you must come in time.在回答引出的问句时，如果是否定的，不能用 mustnt（禁止，不准），而用 neednt, dont have to（不必）.- must we hand in our exercise books today?- yes, you must.- no, you dont have to / you neednt.2) must 是说话人的主观看法， 而 have to 则强调客观需要。must 只有一般

7、现在时， have to 有更多的时态形式。1. he play isnt interesting, i really must go now.2. i had to work when i was your age.3) 表示推测、可能性（只用于肯定的陈述句）1 youre toms good friend, so you must know what he likes best.2 your mother must be waiting for you now.“”“”at the end, xiao bian gives you a passage. minand once said,

8、people who learn to learn are very happy people. in every wonderful life, learning is an eternal theme. as a professional clerical and teaching position, i understand the importance of continuous learning, life is diligent, nothing can be gained, only continuous learning can achieve better self. only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. this