• C1_class 5 (grammar)
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  • I’m sure they lost their way, that’s why they are still not here. (MUST)
    They must have lost their way
  • It wasn’t necessary to lock the doors, even though you did. (NEED)
    You needn’t have locked the door
  • It’s a pity that you didn’t listen to my advice. (TO)
    You ought to have listened to my advice
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