Modals have only one form.

情态动词只有一种形式。

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Do Modals in English Have Tense Forms?

英语情态助动词有无时态形式?。

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Modals are always the first word in a verb group.

情态动词总是出现在动词短语中的第一位。

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You use negative words with modals to make negative clauses.

情态动词与否定词连用可构成否定句。

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You use negative words with modals to make negative clauses.

情态动词与否定词连用可构成否定句。

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