学习和练习情态动词的用法，包括主要情态动词的基本用法。

Goal: Learn to use the Modal Verbs by doing some exercises.

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结果证实了他的关于情态动词用法的假设。

The results confirmed his hypothesis on the use of modal verbs.

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长期以来学者们对英语中的情态动词进行着不断深入的研究，试图找出它们的共性，构建一个统一的模式对其意义和用法进行归纳和概括。

Scholars have been making a deep study of the English modals in an attempt to find out their common qualities and establish a model to sum up and generalize their meanings.

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