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The PT teacher said to his students: 'Pupils, don't shout. Stand still!"
Granny said: "Sally is good at playing the piano"
Mother asks: "What are the kids doing now?"
The doctor said: "You should wash your hands".

В 1 предложении вместо said to -TOLD

The PT teacher said to his students not to shout and stand still.Granny said that Sally was good at playing the piano.Mother asks what the kids are doing now. Или Mother asked what the kids were doing then.The doctor said to me to wash my hands.