1.Someone spoke loudly in the library. I told him not to speak there. 2.Someone smoked in the bus. I asked him to put out his cigarette. 3.Someone was sleeping in class. I told him that it's impolite to do that.
(1)I saw someone pick the flowers in the park. I went on and told him(her) not to do that. (2)I saw a boy throw the litter everywhere. I said that "Litter the rubbish in the bin." (3)I heard a girl speak loudly in the public. I asked her not to make a noise.