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may have been; can’t have been must have been; mustn’t have been may have been; must have been must have been; mustn’t be
promised were promised have promised have been promised
will they go did they go do they go have they gone
promised were promised have promised have been promised
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can' t have been shouldn' t have been mustn't have been wouldn' t have been
promised were promised have promised have been promised
will they go did they go do they go have they gone
promised were promised have promised have been promised
promised were promised have promised have been promised
will have been will be was has been
can't have been shouldn't have been mustn't have been wouldn't have been
can't have been mustn't have been shouldn't have been needn't have been
promised were promised have promised have been promised
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