求助几个英语句子问题1、Every afternoon a lot of students come to the li

求助几个英语句子问题1、Every afternoon a lot of students come to the library to borrow books.每天下午有许多学生到图书馆来借书.）第一个“to”还能理解,但是第二个“to”就不明白了,为什么还要在这儿加个“to”.2、我们大家都相信Jack 是一个诚实男孩.（we all believe in jack who is a honest boy）.他每天早晨洗冷水澡.（he takes shower with cold water every morning)我开窗户你在意吗?(Would you mind what I open the window?)请问我这三个句子写对没有,帮我纠下错,感谢英语方面的能手.