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Modal auxiliary verbs can express a possibility, ability (may, might, can, could, is able to), an obligation (must, have to, have got to, should) a necessity (need), a preference or a repeated past action (would). They are followed by an infinitive verb except in the past tense and their form doesn't vary according to the person (\"need, have to, be able to\" are exceptions). Regarding the next grammatical point of the course, the active voice tense remains unchanged in the passive voice form. \"John bought a book\" (past simple) becomes \"a book was bought by John (to be in past simple + past participle). Defining relative clauses use no punctuation whereas non-defining clauses are marked by comas. Phrasal verbs are a great challenge for non native speakers. They can be intransitive (I got up at 6 am), transitive separable (it turned him off) or transitive inseparable (I don't get along with her).
