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can ?

[误] A blind man can not judge colours.?

[正] A blind man cannot judge colours.?

[误] I cann't call for you at ten.?

[正] I can't call for you at ten.?

[析] can的否定形式应为cannot或can't.?

[误] It's only six o'clock. That mustn't be the postman.?

[正] It's only six o'clock. That can't be the postman.?

[析] must用来表示一种肯定的推断，如：She must have some problems. She keeps crying. 但在否定句中则要用can't， 要表示对过去的推测则要用"must+have+过去分词"的表达法，如：The lights have gone out.A fuse must have blown.而对过去的否定推测则多用"?can't?+have+过去分词"，如：I don't think he can have heard you. Call again.?

[误] We could not help to laugh at once.?

[正] We could not help laughing at once.?

[正] We could not help but laugh at once.?

[析] "couldn't help+动名词"表示禁不住做了某事。但could not help but与could not but后面要加不带to的不定式，意思都是不得不去做某事.如：You could not (help) but respect him.?

can be able to ?

can与be able to都可以用来表示能力，但can只有现在时与过去时，be able to则可用任何时态，如：He will be able to teach the child. 但要表示经过努力而达到的一次性动作则只能用be able to，如：He finally was able to jump over 2?10 meters. 或：The plane was able to fly over the mountain. 但要注意的是这两个词都没有进行时态，而be able to后面不接不定式的被动态。?

can could ?

can与could都可以用在现在时的口语中，只是用could更为礼貌，语气更委婉。如：Could you tell us a story?

【总结】冰冻三尺非一日之寒莫等闲，白了少年头，空悲切百川东到海,何时复西归？少壮不努力,老大徒伤悲。以上就是鄂州中考英语知识的全部内容，小编祝同学们学习进步！

相关链接

湖北14年鄂州中考英语听力指导  荐

中考英语备考必知的复习策略  荐