改错：How long have you been starting your class?

改错：How long have you been starting your class? How long have you been in class today?怎么翻译? ---How long have you been in the class today?-----_________. how long have you been in love with your boss? "How long have you been how,have,in,today,class,long,you,been,for,hours,twelve,over如 How long have you been skating? how long have you been playing basketball ? How long have you been swimming? How long have you been ____? 1.How long have you been here? how long have you been ---work?