We often use "correlation" the most for scientific studies. For example, "there is a correlation between drinking coffee and being focused while working." "Relationship" also works here, but it is more general. You can also use it in more casual situations, such as "Sam and Mary are in a relationship."
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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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