I think you are taking the help from thos who have answered your questions for granted. You are unlikely to improve your English by asking how to form speech patterns. From reading your questions, you don't seem to know what you want to say and how to express a statement as you have intended.
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alc241 Don't eat while playing/Don't play while eatingBoth sentences are correct grammatically. In these sentences you have two actions; they happen nearly at the same time or one of the actions comes before the other. No action is longer
The playing is longer than the eating??