情态动词+虚拟语气Eric情态动词情态动词是一类比较特殊的词汇，它本身没有固定的词义，需要和另外一个动词一起才能构成谓语，用来表示说话者的态度、语气等。除ought需要跟动词不定式外，其余情态动词后跟动词原形。情态动词没有人称和数的变化。可能性顺序：must will would ought to should can could may might can的用法1.表示能力（能做某事）Can you ride a bicycle?I cant promise anything, but I will do what I can.be able to 可以表示相同意思，并还可以明确表示未来时间，甚至用于完成时Our baby will be able to walk in a few weeks.Since his accident he has not been able to walk properly.情态动词2.客观可能性（可以，可能做某事）I can call you tomorrow.Im afraid I cant go with you.3.有时会（不经常如此）Scot
