have been studying过去进行?用法?

have been studying过去进行?用法? 英语have been studying过去进行?用法? have 动词过去分词.和have been 过去分词的用法 How long have you been studying English? i have been studying history in china How long have you been studying? have been 的用法 have been的用法 have been 用法 have been 的用法? 现在完成进行时的被动语态结构是have been +过去分词还是have been+doing 完成进行时（have+been+现在分词） 完成时被动语态（have+been+过去分词） 现在完成时（have+过去分