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。
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.
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.
英语情态动词现在时态的语义和用法十分复杂。
The semantics and the use of the English modal verb in the present tense are very complicated.
英语情态动词现在时态的语义和用法十分复杂。
The semantics and the use of the English modal verb in the present tense are very complicated.
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