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Unit 18 covers modals, passive voice, and phrasal verbs. Modals are verbs used to add meaning to the main verb. Examples include: may, might, must, should, would, could, can, have to, have got to, need to, ought to, and be able to. Modals can make a verb more formal or add an implication that might not otherwise be there if a different modal were used. Passive voice is used to change the object of an active verb into the subject of the passive verb. A key indicator that a sentence is in passive voice is if the phrase has the word \"by\" in it. This does not mean that all passive sentences have the word \"by\" in it, on the contrary, most of the examples given in this unit do not. However, I found this tip to be helpful when I would have otherwise been stumped. An example of an active phrase (in past simple tense) is \"Roose Bolton overtook Ned Stark's castle, and the passive version of this would be \"Ned Stark's castle was overtaken by Roose Bolton.\" In passive phrases, the person who did the deed is not relevant, so you could even say simply \"Ned Stark's castle was overtaken.\
