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开始学习

问题		答案
offering advice 开始学习		you should / ought to
expressing prohibition 开始学习		mustn't / can't / may not
making a suggestion 开始学习		shall
expressing obligation 开始学习		must
general ability in the past 开始学习		could
expressing a positive logical assumption 开始学习		must
lack of ability 开始学习		can't
expressing probability 开始学习		should / ought to / will
expressing possibility 开始学习		could / may / might
absence of necessety in the past 开始学习		needn't
expressing certainty 开始学习		will
making an offer 开始学习		shall
asking for permission 开始学习		can / may / could

modal verbs