it is my job doing/ to do?

it is my job doing/ to do? my job is to do 还是doing your job is to do + it's your job to do+your job is doing吗 类似my job/ambition/dream is to do sth 或doing sth 或to doing st It is my hobby+ to do还是doing My job is to clean the street为什么要用to do而不用doing?具体说明.my favo it is my frist time to do sth / or doing sth/or do sth? If it is a good job,I have got to do some thinking about my it is fun to do 还是 doing? it is difficult to you to do the job To do it is my job .和What you did is right .的主语和系表结构分别是? It is my job to teach them english .