lingling and tom are my classmate中classmate用加s吗

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• she‘s a good student and is always the best in the class in her studies中的studies 为甚么要复数啊?是三单的缘故吗?可是学习是动词吗?那“always“为什么加sshe often helps me with my studies.中的学习也是三单吗?（ps：再问一个问题哦,sports、favourite subjects又什么时候是用复数啊?
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