All modal verbs are auxiliary verbs, which means they can only be used with a main verb. Modal verbs cannot be a main verb. They are used to express ideas such as possibility, prediction, speculation, deduction and necessity.
Learning how to use prepositions of time in on at. This grammar lesson also shows examples of how to use prepositions of time in a sentence. please follow us on Facebook www.facebook.com/learningenglishvocabularygrammar
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