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singing the same song to sing the same song sing a same song to be playing same song
sings sang will sing has sung
don't hear never hear have never heard has never heard
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was writing has written has been writing has been written
doesn’t hear never hear is never heard has never heard
playing played is played has been played
playing played is played has been played
no student has passed the exam no one has passed the exam all the students have passed the exam not all the students had passed the exam
employed devoted applied occupied