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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
have tricked have cheated have been tricked be cheated
have gone to, have been to have been to, have gone to have gone to, have been in have been to, have been in
had played have been playing am playing have been played
may not have been couldn’t have been mustn’t have been needn’t have been
can’t be wouldn’t be mustn’t have been couldn’t have been
came; has been teaching has been; has been teaching came; have been teaching has gone; have been teaching
have，left have；been away have；been away from were：away
had played have been playing am playing have been played
gone , have been hunting for been , have been hunted for been , have been hunting for gone , have been looking for
have been to ; have gone to have gone to ; have been to have been to ; went to went ; have been to
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