现在完成进行时的用法

现在完成进行时的用法
 
一、现在完成进行时的构成方法
现在完成进行时由“have / has + been +现在分词”构成。http://yingyu.chazidian.com
二、现在完成进行时用法说明
表示现在以前这一段时间里一直在进行的动作，这动作可能仍在进行，也可能已停止：
He’s been watching television all day. 他看了一天电视了。
He has been doing this work for three years. 这工作他已干了三年了。
It has been raining since last Sunday. 自上周星期日以来就一直在下雨。
The war has been going on for nearly a decade. 战争已进行近十年了。
Without (a) doubt you have been working very hard. 毫无疑问你工作一向努力。
I have been looking forward to meeting you. 我一直盼望会见你。
The pagoda has been standing there since the Tang dynasty. 这座塔从唐代以来一直矗立在这里。
Biological system has been doing this for billions of years. 生物系统这样做已经有多少亿年了。
The Truman government has been spending some $ 200 billion yearly for war preparations. 杜鲁门政府一直每年花2000亿美元用于战备。
现在完成进行时有时表示根据直接或间接的证据得出的结论：
She is very tired. She’s been typing letters all day. 她很累了，她整天都在打信件。
Her eyes are red. She has been crying. 她眼睛红了。她一直在哭。