How long have you had a stomachache?这是什么时态

How long have you been how long have you been learning english? How long have you been studying? How long have you been in China? how long have you been dancing today? how long have you studied in this How long have you been there? How long have you live in China How long have you ----(live)here? “How long have you been watching —— （______ ）have you lived there?Since 1970 A．how soon B.how often C .how long D.when Work ha—— （______ ）have you lived there?Since 1970A．how soon B.how often C .how long D.whenWork hard ,_____you will catch up with others.A.or B. how long have you done与how long have you been的区别 How long have you been skating?与How long did you skate?的区别 How Long have you felt thisHow Long have you felt this way?翻译成汉语 How long have you been here?为什么是How long have you been here,不是How long have you been standing here? How long have you been collecting shells?翻译 英语：how long have you been collecting shells?主要语法 翻 译 How long have you been like this?