Section_ⅢGrammar-_现在完成进行时

　　语法图解

　　探究发现

　　①Well, we've been finding the bones of tigers and bears in the caves, and we think these were their most dangerous enemies.

　　②It has been raining since last week.

　　③He has been writing a novel, which will be finished next month.

　　④He has written a novel, which is being prepared to come out now.

　　⑤I have been visiting my hometown recently, and it impresses me differently each time.

　　⑥I have visited my hometown recently, whose changes have left a deep impression on me.

　　⑦Recently she has always been helping me.

　　⑧Recently she has helped me a lot.

　　[我的发现]

　　(1)由句①②③看出现在完成进行时的构成形式为：have/has＋been＋doing。

　　(2)比较句③④，现在完成进行时强调动作未完成；而现在完成时强调动作已经结束。

　　(3)比较句⑤⑥，现在完成进行时强调动作的重复，现在完成时可以表示一次性动作。

　　(4)比较句⑦⑧，现在完成进行时表示一种感情色彩；现在完成时则陈述一种事实。

　　一、现在完成进行时

　　1．基本含义：表示一个在过去开始而在最近刚刚结束的动作；表示一个从过去开始但仍在进行的动作；表示一个从过去开始延续到现在，可以包括现在在内的一个阶段内，重复发生的动作，通常表示一种感情色彩(关切、惊异、愤怒、赞许等)。

　　2．基本结构：have/has been doing

　　We have been waiting for you for half an hour.(动作刚结束)

　　我们一直等了你半个小时。

　　The Chinese have been making paper for two thousand years. (动作还将继续下去)

中国有2 000年的造纸历史。