现在完成时表示动作已经完成，着重强调现在的影响和结果。现在完成进行时表示的动作不一定已经完成，强调动作的延续性和动作发生时的情景。He has been reading the book all the morning.He has read the book.Liu Fang has been living in Canada since then.I have been telling you to be careful for weeks.练习：1