这些都是属于介词 所以这些词的后面动词应该是doing的形式
with sb (with me/her/him/us.)I with you
to do ( want to do)I want to be a teacher
at某地区(at home at用于地点时后面地点必须是小地点 像家、学校、小镇)Tom at home now
if 主要是主将从现(if有如果之意 如果放在主将从现中if后面跟从句)If you want to be a doctor,you need .
of 一般用于介词 后面动词加ing就可以了