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This Unit is about modal and phrasal verbs, passive voice. Modals can be used to express the following: obligation (must), possibility or probability (might), permission or prohibition (may), ability (can), advice (should). There are two voices used in English: active and passive. In the passive voice, the object of an active verb becomes the subject of the passive verb. There are defining and non-defining relative clauses. The second type is used with commas to indicate the distinguishing characteristic.
