Modal verbs affect the information dissemination and the construction of the meaning of a sentence because they are able to join the main verb of the sentence, modifying the modality of that verb and showing new information.
From a simplified perspective, we can say that the only function of modal verbs is to indicate a modality. This modality can indicate:
The main modal verbs are: will, can, should, shall, must, would, may and might.
Examples:
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