what´s the matter?, so what appears to be the trouble?, it keeps on + verb + -ing, it's always + verb + -ing, what´s wrong with it exactly?, what do you mean by...?, what sort of noise/smell is it?, when you say ... , do you mean ...?, it sounds like..., it looks as though, the best thing would be to, have you tried +noun +verb +-ing ? , that should solve the problem, that should fix it,

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