She sweeps the floor every day.一般现在时
She is sweeping the floor.现在进行时
She was sweeping the floor at that time.过去进行时
She swept the floor half an hour ago.一般过去时
She will sweep the floor in a minute.一般将来时
She has swept the floor for two weeks.现在完成时
She said she would sweep the floor in a minute.过去将来时
She had swept the floor before I came back.过去完成时