make friends who speak urdu. Ask your parents, colleagues if what you're saying in urdu is making sense. If not, how should you rephrase a certain sentence. If you can read urdu, then read urdu newspaper.
urdu main kiya grammer dekhna, yeh koi english thori hai kay jo grammer ka khayal rakha jaye.
mazeed, yeh kay alfaz ka talufuz (pronunciation) sahi hona chahiaye.
fakhta bhai ki mojodgi main urdu ki koi fikar na karain. jab bhi moqa lagay un say poch liya karain. woh mashAllah say iss zamany main urdu ka chalta phirta encyclopedia hain.
jaisay ham app say english kay naye naye word sekhtay hain. issi tarah app bhi ham say urdu kay word sekh liya karian.
another day, i was reading your post on gs, and found new word "ostentatious". that drove me to search the meaning of it. :D