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Hi!
Could you, please, explain why I can't say ' It was described using some dull colours'. My teacher insists on '... by using...' . Is it really a mistake?
Others, as I, may be unsure what 'it' is, and how something is 'described' in dull colours unless this is a literary (rather poetic) manner of writing.
"He was able to capture the bleakness of life at that time by using only dull colours when painting apparently joyous family scenes."
Using a minimum of brush strokes, he nevertheless caught the sweeping vista of the Kanungra Plateau.
was given a poor mark 
Linear Mode
