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1、用法用法 be able to 能，能力能，能力 e.g. 我可以唱一首英语歌曲。我可以唱一首英语歌曲。 I can/am able to sing an English song. 过去式：过去式：could e.g. 我十年前就能做到那样。我十年前就能做到那样。 I could do that 10 years ago. 否定式：否定式： cannot = cant 情态动词情态动词can +V.原原结构结构肯定肯定Sb + can + V.原原 + 其它其它. eg: Peter can speak English.否定否定Sb + cannot/cant + V.原原 + 其它其它.
2、eg: Peter cant/cannot speak English.一般疑问句一般疑问句Can + Sb + V.原原 + 其它其它 +?eg: Can Peter speak English?特殊疑问句特殊疑问句特殊疑问词特殊疑问词+can+Sb+V.原原+? eg: What can Peter speak?( ) 1.- _ you help me with this Maths problem? - I _ not work it out. A. Can; mayB. Must; must C. Can; can D. May; may( ) 2. The boy _ run very fast. He wants to be a top runner as Liu Xiang in the future. A. can B. cant C. may D. may not3. Excuse me, _ you tell me the way to the nearest park?4. You _ go with us to the zoo if you want to.5. I _ speak Chinese very well, but I _ speak French at all.Exercise