we have to wear sports shoes for gym class.为何不用in gym class?

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we have to wear sports shoes for gym class.为何不用in gym class?

we have to wear sports shoes for gym class.为何不用in gym class?
we have to wear sports shoes for gym class.为何不用in gym class?

we have to wear sports shoes for gym class.为何不用in gym class?
这里for 表示对象是体育课,而in更倾向于表示上课时,强调重点不一样.

这里强调的是为了上体育课我们必须穿球鞋,而不是说在体育课上穿球鞋,所以用for 不用in.

因为gym class并不是表示地点的。for在此处表目的