情态动词
情态动词表示说话人对动作或状态的各种观点和态度,如需要、猜测、意愿或怀疑等。情态动词有词义,但不完全,是所谓的“辅助性”动词,在句中不能单独充当谓语。
一、 情态动词的特征和形式
A. 情态动词的各种形式见下表:
情态动词 否定式 简略否定式
may might can could must have to ought to will would shall should need dare used to 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 mayn't(老式英语,现在不常见) mightn't can't couldn't mustn't don't have to oughtn't to (否定句中to可省略) won't wouldn't shan't (只用于英国英语) 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。2.情态动词+be doing She must be listening to pop music. 她肯定在听流行音乐。 You should be reviewing your lessons. 你应该在复习功课。 My mother maymight be cooking now. 我妈妈可能正在做饭。
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