is,to,ing,for,of,the ,s 的用法答:一. is 用于一般现在时,当主语是第三人称单数时( he, she, it, this, that, Tom, Kate, my father, his aunt等)如:My father is a worker. My mother is a nurse.二. to 介词 prep.1.向,往,到 She lives in the house to the right.她住在右边的房子里。This road leads to Pari...