Modal verbs are auxiliary verbs that can only be used with a main verb, they cannot be the main verb. It is used to express modality, that is likelyhood, ability, permission, and obligation.
Examples:
Can I go to the party?
Could you read when you were two years old?
Retrieved from:
http://languagelearningbase.com/85188/english-modal-verbs
on March 31, 2015
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