现在完成时have/has+done
现在完成时的被动语态have/has+beendone
现在完成时的标志性时间状语already,ever,never,yet,just,before,still,lately,since,foralongtime,uptonow,until,sofar,inthelastfewyears/weeks/mouths,tillnow,recently
现在完成时have/has+done
现在完成时的被动语态have/has+beendone
现在完成时的标志性时间状语already,ever,never,yet,just,before,still,lately,since,foralongtime,uptonow,until,sofar,inthelastfewyears/weeks/mouths,tillnow,recently