MODALS AND THEIR FUNCTION Modal Function Examples Must To express necessity/obligation Ø I must finish tiss task by ten today. Ø Student must do the test in less than hour. To express a strong degree of certainty Rio : why is Johan absent today? Tina : he must be sick. Should/ought to To express advisability F You ought to go to the doctor now. F We have work hard. We should take a rest. Can
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