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Modals can be used to express different ideas such as obligation, possibility or probability, permission or prohibition, ability and advice. Modal auxiliary verbs can be also sued to express differing degrees of formality. There are two voices used in English, the active and the passive. There are three categories of clauses, independent, dependent, and relative. Finally there are three types of phrasal verbs, intransitive, transitive separable, and transitive inseparable.
