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Unit 18 overviews a variety of grammar concepts including modal auxiliary verbs, phrasal verbs, and passive voice. The modal verbs include can and might which express ideas such as obligation, probability, permission, ability, and advice. Phrasal verbs are multi word verbs which operate as one item and there are 3 subtypes which include intransitive, transitive separable, and transitive inseparable. Intransitive verbs cannot be followed by an object and transitive separable can only have an object pronoun come between. Inseparable transitive verbs are unable to have anything in between them. Passive voice as opposed to active voice is generally used to shift the focus of the sentence. In active sentences the subject usually has the emphasis of the sentence; however, in passive voice sentences the action is spread more evenly through between the object and the subject. A classic example of this is the sentence trespassers will be arrested. The precise agent is irrelevant but the object (getting arrested) is very important, thus, passive voice is perfect.