Is "vary over" same with "change depend on"?
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Native speaker’s answer
Rebecca
Yes, to "vary over" is similar to "change depending on". To "vary" in this context means to change, differ, or fluctuate in the amount. "Over" in this case refers to over the hours, which means during the next couple hours. The main difference between these two phrases is that to "vary over" does necessarily involve something "depending on" another thing. Ex: Her grades vary over time. Ex: His performance in basketball has varied over the past few months.