現(xiàn)在完成時(shí)用于過(guò)去發(fā)生并對(duì)現(xiàn)在造成影響的情況.例如：
He may have gone to bed.
現(xiàn)在完成進(jìn)行時(shí)用于從過(guò)去一直延續(xù)到現(xiàn)在并仍將繼續(xù)延續(xù)的動(dòng)作或狀態(tài).
I have been going to school