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¡¡¡¡¡°May we leave now£¿¡± ¡°No£¬ you mustn't. You haven't finished your home work yet.¡±
¡¡¡¡4. can ºÍ be able to
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¡¡¡¡1£©My grandma is over seventy£¬ but she can still read without glasses.
¡¡¡¡2£©He is able to give up his bad habits.
¡¡¡¡5. must ºÍ have to
¡¡¡¡must ºÍ have to ¶¼¿ÉÒÔ±íʾ¡°±ØÐ롱£¬µ«Óм¸µãÇø±ð£º
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¡¡¡¡1£©You must come to the classroom before eight.
¡¡¡¡2£©It is raining hard outside£¬ but I have to leave now.
¡¡¡¡3£©¡°Must we do it now£¿¡± ¡°No£¬ you needn't.¡±
¡¡¡¡6. used to +v£¬ be used to +v-ingºÍbe used to +v
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¡¡¡¡1£©He used to smoke. Now he doesn't.
¡¡¡¡2£©He's quite used to hard work / working hard.
¡¡¡¡3£©The knife is used to cut bread.
