In English we have several modals that help us to form sentences. A modal verb is a type of auxiliary verb. In addition, modal verbs do not take the inflection -s or -es in the third person singular, unlike other verbs.
For brief explaination please download :
http://www.4shared.com/document/QweJW5sq/MissMega-Modals.html
http://www.4shared.com/document/i_RaZukb/MissMega-Exercise_ability.html
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