精选优质文档-倾情为你奉上一般 ( do )进行 ( be doing )完成 (have done )完成进行 ( have been doing )现在do/doesam/is/are doinghas/have donehas/have been doingam/is/are doneam/is/are being donehave/has been donehas/have been being doneHe comes every day.He is sleeping.He has finished his homework.He has been doing his homework for three hours.often, always, usually, sometimes, on Sunday, every , at weekends, once in a while, three times a day(right) now, at this moment, at
