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can, could, may, might, shall, should, will, would, must, have to, have got to, need to, needn't, ought to used before other verbs to add to main verb (in its base form) in present and future. Past modals with more than one meaning may express past ideas in diff ways. express: obligation, possibility, permission/prohibition, ability, advice I really must go now. I might go shopping tomorrow. You may leave now. I can speak six languages. You should see a doctor about that. don't change in form according to person. active: my wife chose the wallpaper passive : the wallpaper was chosen by my wife Object of active verb becomes subject of passive verb. Both sentences have same meaning - focus is different. Shift from wife focus to subject focus (wallpaper). Sometimes agent (do-er) isn't there - I painted the door last week VS The door was painted last week. used when it is not known/important/don't want to say who performs the action be + past participle for passive and active, tense of sentence always remains the same. In passive, tense is indicated by BE, in active voice, tense is shown by main verb. (Last night a man was murdered). Phrasal verbs (PV) multi-word verbs = verb + one or two particles (may be a preposition, adverb or adverb + preposition). She told Paul off.
