ihavebeenteachingsince10yearsago为什么teach要加ing那是以进步行时been 后动词要加的呀
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![ihavebeenteachingsince10yearsago为什么teach要加ing那是以进步行时been 后动词要加的呀](/uploads/image/z/11879156-20-6.jpg?t=ihavebeenteachingsince10yearsago%E4%B8%BA%E4%BB%80%E4%B9%88teach%E8%A6%81%E5%8A%A0ing%E9%82%A3%E6%98%AF%E4%BB%A5%E8%BF%9B%E6%AD%A5%E8%A1%8C%E6%97%B6been+%E5%90%8E%E5%8A%A8%E8%AF%8D%E8%A6%81%E5%8A%A0%E7%9A%84%E5%91%80)
ihavebeenteachingsince10yearsago为什么teach要加ing那是以进步行时been 后动词要加的呀
ihavebeenteachingsince10yearsago为什么teach要加ing
那是以进步行时been 后动词要加的呀
ihavebeenteachingsince10yearsago为什么teach要加ing那是以进步行时been 后动词要加的呀
have been doing为现在完成进行时态,表主动动作,即从过去某一时间开始一直持续进行到现在为止的动作,还有可能继续进行下去,如:The building has been completed.大楼已经被盖好了.They have been building the hall.他们一直在建造着那所礼堂.(表主动动作,该动作尚未停止,只有延续性动词才能用于此种时态,而have been done无此限制,但必须是及物动词才能用于被动语态).