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Modal verbs explained with examples #learnenglish http://www.uniquelanguages.com

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Modal verbs definition and examples and uses English grammar

easypacelearning.com

Using English Modal Verbs to make requests. This link has a situation table for using modal verbs.

Learn English Modal Verbs

really-learn-english.com

Can and Could in English - Modal Verbs

Can - Could - English Grammar

grammar.cl