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Modal auxiliary verbs add meaning to the main verb. They express a number of ideas such as obligation, possibility, permission, ability, advice. In passive voice the performer of the action is not important or not known. Only transitive verbs are used in the passive. There are 3 categories of clauses: independent, dependent and relative. A relative clause is a dependent clause that modifies a noun. It may be defining (the information in it is essential to the meaning of the sentence) or non-defining (the information is not essential). Phrasal verbs can be intransitive, transitive separable and transitive inseparable.
