could的用法（情态动词should和could的用法）

大家好,小活来为大家解答以上的问题。情态动词should和could的用法，could的用法这个很多人还不知道,现在让我们一起来看看吧！

1、情态动词can与could用法1. 表示能力表示现能力用can:My sister can drive. 我妹妹会开车Everyone here can speak English. 儿人人会说英语表示来能力通常用can或could而用be able to来时态:I’ll be able to speak French in another few months. 再过几月我会讲法语了One day people will be able to go to the moon on holiday. 总有天人们月球上去度假若表示现决定来否有能力做某事则用 can:Can you come to the party tomorrow? 明天能来参加我们聚会?表示过去能力有时用could有时能用could具体应注意下几点:① 若表示过去般能力用could:Could you speak English then? 时候会说英语?② 若表示过去特定能力则能用could而用wasable to do sth或用 managed to do sth或用 succeeded in doing sth 等He studied hard and was able to pass the exam. 学习努力所考试能及格At last he succeeded in solving the problem. 终于把问题解决了【注】could 用来表示过去特定能力通常只限于肯定句否定句或疑问句则表示过去特定能力:I managed to find the street but I couldn’t find her house. 我想法找了条街没找房子另外could还与表示感知动词连用表示特定能力:Looking down from the plane we could see lights on the runway. 从飞机上向下看我们看见机场跑道上点点灯火还有间接引语could也表示过去特定能力:He said he could see me next week. 说下周能见我2. 表示许对于现或来许要区分下两种情况:① 表示请求允许两者均用用could 语气更委婉:Can [Could] I come in? 我进来?注:此时也用may或might其might和could均表过去只表委婉语气② 表示给予允许 般只用 can而用 could:"Could [Can] I use your pen?" "Yes of course you can." 我借用钢笔?当对于过去许也要区分下两种情况:① 表示过去般性允许用can过去式could:When I lived at home I could watch TV whenever I wanted to. 我住家里时 想时候看电影时候看② 表示过去特定允许则用 could而需换成其表达:I was allowed to see the film yesterday evening. 昨天晚上允许我去看了电影3. 表示推测对现或来推测两者均用can 通常只用于否定句或疑问句般用于肯定句而could则用于肯定句、否定句和疑问句:It can’t be true. 能真What can they be doing? 们会干呢?We could go there this summer. 今年夏天我们能要去儿You could be right but I don’t think you are. 能对我并认对can 有时也用于肯定句表示推测主要见于:① 表示理论上能性:Even experienced teachers can make mistakes. 即使有经验教师也能出错② 用于含有only等表示限制肯定句:"Who is that at the door?" "It can only be the postman." 门外谁?只能邮递员③ 接be +形容词表示有时会、时常会等:It can get very hot here. 里有时会热She can be very unpleasant. 有时令人讨厌对过去推测必须 can could 之接动词完成式此时can仍只用于否定句或疑问句用于肯定句;而could则用于各种句型:He can’t [couldn’t] have seen her there. 能儿见He could have gone home. 能已回家了could接动词完成式除表示对过去推测外还有下用法:① 表示过去没有实现能性:He could have told her but he didn’t choose to. 本来告诉却没有I could have lent you the money. Why didn’t you ask me? 我本来借笔钱给问我?② 用来委婉地责备某人过去应该做某事而没有去做:You could have helped him. 本来应该来帮助You could have been more considerate.本考虑得更周③ 表示差点儿要:I could have died laughing. 我差点儿笑死了。

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