That's a good place for people to swim in还是to swim老师说要加to,可是我的直觉告诉我这不科学,错了,老师说要加in.好吧,在people后面加个句号先

That's a good place for people to swim in还是to swim老师说要加to,可是我的直觉告诉我这不科学,错了,老师说要加in.好吧,在people后面加个句号先
That's a good place for people to swim in还是to swim老师说要加to,可是我的直觉告诉我这不科学,
错了,老师说要加in.好吧,在people后面加个句号先

That's a good place for people to swim in还是to swim老师说要加to,可是我的直觉告诉我这不科学,错了,老师说要加in.好吧,在people后面加个句号先
这个是不定式做定语的问题
to swim做Place的定语,如果去掉to,不合乎语法,
for people 是to swim in的状语
介词in不能省略.