modal verbs
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Modal Verbs 情态动词的语法特征 1) 情态动词不能单独做谓语 除ought和 情态动词不能单独做谓语, 和 have外, 后面只能接不带 的不定式. 的不定式. 外 后面只能接不带to的...

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Modal Verbs Modal verbs

advertisement Modal Verbs Modal verbs can could may might will would must shall should ought to Modal verbs are often us

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