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：
The Changes of Raising a Pet 养宠物带来的改变
国内英语资讯:China asks for restraint on Korean Peninsula nuclear issue
国内英语资讯:Chinese Vice Premier hopes youth exchanges help advance ties with Japan
The Free Life 自由的生活
国际英语资讯:Emergency declared in Pakistans Karachi as heavy rains continue
体坛英语资讯：Coutinho fit for Brazil World Cup qualifiers, says doctor
国际英语资讯:About 40 died or feared dead in Texas caused by Hurricane Harvey: local officials
饭后犯困是因为吃饱？真相震惊到了我！
体坛英语资讯：Osaka, Tsitsipas through to China Open quarterfinals
体坛英语资讯：Four Chelsea players called up for Englands Euro qualifiers
哈维缓慢撤离德州,洪水威胁不减
体坛英语资讯：Lin Dan claims hard-fought opening victory at National Games
体坛英语资讯：Matthaeus: Loew gambled away two European titles
美军太平洋司令部司令可能被提名出任美国驻澳大使
体坛英语资讯：10-man Iran draw S. Korea in 2018 World Cup qualifier
How to Be Helpful 如何帮助人
如何翻译动词的时态和语态？
体坛英语资讯：Chile coach Pizzi hails attacking options
国内英语资讯:China lifts 13.9 million people out of poverty each year
中国“单身经济”迎商机
体坛英语资讯：PREVIEW: Pressure builds on Messi and Argentina in World Cup qualifiers
国际英语资讯:British PM arrives in Japan for talks with Abe
体坛英语资讯：Federer survives scare to beat Youzhny for 17th time at US Open
研究发现：拍照能增强人们对生活的记忆
除了《冰雪奇缘2》 11月上映的这些电影也不容错过
中国“单身经济”迎商机
国内英语资讯:Political advisors brainstorm targeted poverty relief
带你一图了解金砖史
日本引入了包括埃博拉在内的5种致命病毒
美文欣赏:不必把太多人请到你的人生中