close to home中的to是介词,能告诉我具体什么情况下to是介词吗?

to 为介词：1.[表示方向等,与 from 相反]向,往,到：turn to the right 向右转2.[表示时间的限度]直至；到…为止； 在…之前：to this day 直到今天3.[表示程度、情况、数量的限度]及于；至；达到：wet to the skin ...一般情况下，to后面跟的是名词或名词性从句时是介词，后面跟动词一般是不定式。不过在下面这些搭配中to是作为介词的：look forword to, be used to ,get down to , object to, be devoted to ,make a contribution to ,resort to, react to, contribute to, be accustomed to, be committed to ,be exposed to ,be dedicated to , be opposed to , be contrary to ,with regard to ,with a view to ,as to ,in contrast to