'cannot'(缩写为'can't')表示当前或未来某种事情不可能发生,强调现在和将来的事实和状态;而'couldnot'(缩写为'couldn't')表示过去某种情况不能发生或某种行动无法完成,强调过去的事实和状态,且语气更委婉、更礼貌。 'Cannot'和'Could not'的基本定义与用法 'Cannot'和'Could...
在否定句中,用cannot/could not (不可能),may/might not (可能不)表示 推测。 (1)表不对现在或将来的否定推测,用“ cannot/could not/may not/might not+ 动词原形”结构。 Though he is busy, he can’t refuse your invitation because you are good friends. ...
cannot 是主观上不能做，比如 I cannot shoot him .是我不能向他射击的意思，而 I could not shoot him，则是我射不到他，我不能够射到他，这样明白点么，could not 是指客观上做不到某事，你可以简单的理解为汉语的 我不做 和 我做不到 。我们常听到的 I cannot do it 是说我不能这样...
they are different because cannot means you're saying that you're not gonna able to go swimming (later), But could not means you're saying that you didn't get a chance to go swimming (earlier).Cannot is present tense. Could not is past tense. Could not Cannot difference? In statements...
cannot 是主观上不能做,比如 I cannot shoot him .是我不能向他射击的意思,而 I could not shoot him,则是我射不到他,我不能够射到他,这样明白点么,could not 是指客观上做不到某事,你可以简单的理解为汉语的 我不做 和 我做不到 .我们常听到的 I cannot do it 是说我不能这样做,是主观意识下的...
cannot=could not =must not may not=might not 你要注意一下could和can表可能性的时候有区别 couldnot和cannot就是完全一样的语气，非常肯定的 不可能 不可以
百度试题 结果1 题目10. We could not (cannot, could not) hold onto it. It went away. 相关知识点: 试题来源: 解析 答案见上 反馈 收藏
could 从语气上讲比can 更委婉 一般虚拟语气就是把时态向前推一个 比如 if的虚拟语气 if I were a bird,I could fly all over the world.此处就表示与现在的事实相反，我现在要是一只鸟的话，我会周游全世界。但事实并非如此，所以if 条件句就用一般过去式来表达，从句也用一般过去式来表达。
这是一个固定用法。cannot 的意思 跟 can not 是一样的，可是就是不能分开写，一定要连在一起写。或者写成 can't.could not 可以分开写，或者写成 couldn't
acould not start Cannot talk to klauncher:Did not recelve a reply.Possible causes include:the remote application did not send areply.the message bus security policy bloked the reply.the reply timeout expired,or the network connection was broken. 不能开始不能与klauncher谈话:没有recelve回复。