摘要：A. 情态动词的各种形式见下表: 情态动词 may might can could must have to ought to will would shall should need dare used to 否定式 may not might not cannot/can not could not must not do not have to ought not to will not would not shall not should not need not dare not used not to did not use to 简略否定式 mayn't mightn't can't couldn't mustn't don't have to oughtn't to won't wouldn't shan't shouldn't needn't daren't usedn't to didn't use to B．情态动词除ought to, used to等外.后面只接不带to的不定式. 1．情态动词+do You shouldn't be so careless. 你不该这样粗心大意. Jessica told him yesterday she might not go on the trip. 杰西卡昨天告诉他.她可能不去旅行了. Difficulties can and must be overcome. 困难能够而且必须克服.

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