12. SHALL SHOULD /OUGHT TO MUSTN'T DON'T HAVE TO NEEDN'T NEED TO HAVE TO MUST Would you open the window, please? (formal) WOULD May I join this team? (polite) MAY It may/might rain tomorrow MAY/MIGHT Mark could join us at the cinema Could you help me with the suitcases? (polite) She could run fast when she was a child (past) COULD I can't eat a whole cake by myself CAN'T I was able to finish my homework on time BE ABLE TO I can meet you later Can you call me tonight? Mary can swim very fast CAN INABILITY POSSIBILITY REQUEST ABILITY
13. SHALL SHOULD /OUGHT TO MUSTN'T DON'T HAVE TO NEEDN'T NEED TO HAVE TO MUST WOULD MAY MAY/MIGHT COULD CAN'T BE ABLE TO CAN Shall I help you with your luggage? You musn't exceed the speed limit I need to cook dinner tonight. I have to buy the tickets today You must bring your books to class (strong) Would you like something to drink? You could exercise and eat healthier food (plite) That can't be the price - it's much too cheap You can't drive without a licence OBLIGATION/ NECESSITY SUGGESTION/ OFFER DISBELIEF PROHIBITION
14. You should/ ought to improve your pronunciation I don't have to get up early tomorrow You needn't bring anything to the party She's got a great job. She must be very happy. ADVICE/ OPINION LACK OBLIGATION/ NECESSITY CERTAINTY OF TRUE SHALL SHOULD /OUGHT TO MUSTN'T DON'T HAVE TO NEEDN'T NEED TO HAVE TO MUST WOULD MAY MAY/MIGHT COULD CAN'T BE ABLE TO CAN
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