They heared Mary to play\play the violin

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TheyhearedMarytoplay\playtheviolinTheyhearedMarytoplay\playtheviolinTheyhearedMarytoplay\playtheviol

They heared Mary to play\play the violin
They heared Mary to play\play the violin

They heared Mary to play\play the violin
play;
hear sb do sth:听到某人做某事；do前面的to一定要省略.