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International English Grammar Skill - Modal Verbs To Express Ability Learn how to use Modals of Ability in English Be able to Can/Can't Be able to Could/Couldn't Managed to Be able to
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English Grammar Lesson: Can, Could, Be Able To, & Was Able To | Happy English – Free English Lessons
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Modal Verbs Teaching Modals to Low-Level ESL Students Julian Elias Sac State English Language Institute & Cosumnes River College. - ppt download
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