Modals are special verbs which behave very irregularly in English.Here are some important differences:
1. Modal verbs do not take "-s" in the third person.
Examples:He can speak Chinese, She should be here by 9:00.
2. You use "not" to make modal verbs negative, even in Simple Present and Simple Past.
Examples:He should not be late, They might not come to the party.
3. Many modal verbs cannot be used in the past tenses or the future tenses.
Examples:He will can go with us. Not Correct:She musted study very hard. Not Correct
Common Modal Verbs: Can, Could,May,Might, Must, Ought to ,Shall ,Should, Will ,Would.
Click here for more info: http://www.elearnenglishlanguage.com/ingles/gramatica/verbosmodales.htmlhttp://www.first-certificate.com/Modals-fceExercises here: http://web2.uvcs.uvic.ca/courses/elc/studyzone/330/grammar/330-modals-ability1.htm
More exercises: http://a4esl.org/q/h/0101/ig-modals.html
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