How long have you been ill

"How long have you been 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? “How long have you been watching how long have you been 用法 How long have you been in China? How long have you been studying English? How long have you been working here?