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The 'modals' are: can, could, may, might, shall, should, will, would, must, have to, have got to, need to, needn't and ought to. They are used before other verbs to add meaning to the main verb. Modals can be used to express a number of different ideas, such as: - Obligation ? I really must go now, my friend's expecting me. - Possibility/probability ? I might go shopping tomorrow. - Permission/prohibition ? You may leave now. - Ability ? I can speak six languages. - Advice ? You should see a doctor about that. Modal auxiliary verbs can also be used to express differing degrees of formality. Compare ?Can I borrow some money?? with ?May I borrow some money??. Even though they have similar meanings, they would be used in different situations, as the second sentence is more polite than the other. Modal verbs don't change in form according to person. Compare the modal I can play/he can play with the present simple I play/he plays. To use modals to express ideas in the past the situation is somewhat more complicated; modals with more than one meaning may express past ideas in different ways according to meaning. Two voices: The Active and Passive Passive: In the passive, the object of an active verb becomes the subject of the passive verb. In the passive voice, the agent (or 'doer' of the action) is much less important, or doesn't appear. Only transitive verbs (verbs followed by an object, such as sell, take, buy, write, etc.) are used in the passive. It is not possible to use verbs such as happen, sleep, come and seem (intransitive verbs) in the passive.
