Question

请问can 和could的用法和分别

Answer 1

我想讲
楼上两位都答得唔错
could当然系 can既过去式
但系用法上系完全咁简单架... 我谂问问题既人系比较想知usage上比较详细既分别: 1 当解作可以/有能力
could就系can既past tense: I can swim. I can't swim now
but I could when I was young. 这楼上都已经详细说明了....但还有很多can同could既分别: 2. could要在 reported speech (转述)中代替can: Sam: 'I can't go' Sam said that he couldn't go. 3. 讲未来发生可能性要用could: I could e tomorrow if you want.如果你想
我明天可以来 比较: I can e tomorrow. 我明天能够来(can系讲有冇能力) 4. can同could在问句中语气不同: can系问能力 or 差唔多等于命令 could系问可唔可以(有礼貌) 比较: Can you fix your bed?? (这是阿妈讲的
唔可以say no) Can you drive? (问能力) Could you help me on this? (问同事
有礼貌
唔系命令) 5. 建议某人可做某事
我地会讲could have (done something)
但唔会讲 can have You could have met me at the station
couldn't you?? 因为系建议
系假设性既情况
所以要用 past tense既 could喇 就系咁....
参考: myself
I live in US
can系普通既现在色！意思系可以！！可以讲Ican fly. could系can既过去色！如果你话I　could　go　xxxx.（x代表一个地方） could既后面就唔洗转过去色！！
could 系can既过去式 can指可以 could / can 你可以做到的！ You can do it ！(结果未知） 如果你努力一点，你可以做到的 If you worked harder
you could do it !（结果巳定了） If you worked harder
you could do it 这个例子真的不太好 改一下： could / can If you practise more
you can pass the exam (考试还没开始) If you practised more
you could pass the exam. (考试结束罗，但没及格) If you have practised more
you could have passed the exam也是可以的 不过用have verb (pass tense)的发生时间指的是接近现在(now)，像说几天前或一周前 基本上加不加have，大家都明白是过去意思了，只是加了have念起来会有比较严厉的感觉
参考: .knowledge.yahoo/question/?qid=7007033104872