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Modal Auxiliary verbs are: can,could, may, might, shall, should, will, would, must, have to, have got to, needn't and ought to. They are used before other verbs to add meaning to the main verb.They can be used to express different ideas, such as: Obligation, possibility/ probability, permission/ prohibition, ability and advice. It also can be used to express different degrees of formality. Modal verbs don't change in form, they are followed by a verb base. There are two voices used in English, active and passive.In the passive, the object of an active verb becomes the subject of the passive verb. There are three kinds of relative clauses in English: independent, dependent and relative. Independent clause is a complete sentence, which contains the main subject and verb of a sentence; Dependent clause is not a complete sentence, it must be connected to an independent clause; Relative clause is a dependent clause hat modifies a noun, it describes identifies, or give further information about a noun.
