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37.Mr Smith said:"Have you taken the other two courses yet?"
38."Do I have to lock both of the doors?", the janitor asked. 39.The fireman asked my roommate:"Did you ring the fire alarm?" 
40.She said to me:"Did you break this window last night?" 
41."Don't play with that dirty cat", the father said to his son. 
42.My neighbour said to he naughty boy:"Don't damage the .flowers in my garden"
43."Don't frown at me like that", my sister said to me.  44.Her aunt said to Mary:"Don't buy expensive tickets for the concert"
45."Don't be lazy", our teacher said to us.
46."Get a taxi" , my adopted father said to me.
47."Give us some coffee", the students asked me.
48.The sick person said to me: "Don't give me any cream and sugar". 
49.I say to the policeman:"Show me where the post officeis".  50.We said to the painter: "Don't leave your brush and paint here". 
51.The said to us:"Write these two exercise"