correlated is more technical or scientific, and usually describes trends or patterns that move in the same direction. obesity is correlated with the number of calories you eat. the length of the day is correlated with the time of year. related is more general, and just means that two things are similar, or share something in common, or are connected somehow. if it describes trends, they can move in the same or opposite directions. cats are related to tigers. I am related to my brother. the sound of a guitar is related to how fast its strings vibrate.
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Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
Can ask all types of general questions and can understand longer answers.
Can understand long, complex answers.
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