When we talk about general ability in the past, we use , can, could, was\were able to, managed to, When we give a piece of advice, we use , must, have to, need, should\ought to, When we talk about specific achievement in the past, we use, could, can, canned, was/were able to, When we talk about prohibition, we use, don`t have to, don`t need to, mustn`t, ought to, When we want to ask permission, we normally use, can, could, might, may, might,can, can,could,may, could, might, When we want to give permission, we use, can, may, can, could, may, can,could, can, might, If someone tells you, "You musn`t use computers for your personal needs", it means, we can do it, but it`s not necessary, we aren`t allowed to do it, If someone says, "I must buy new clothes", it means, It`s their decision, Someone told them to do that, "Maybe he`ll be at work tomorrow" means, He must be at work, He may be at work, If I were you, I would confess =, You should confess, You must confess, If I _______ sing, I`d be a member of a band, can, could, was able to.

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