语法攻略：熟练掌握现在完成进行式的用法

定义:现在完成进行时表示动作从过去某一时间开始，一直延续到现在，可能还要继续下去。
构成:have/has+been+动词的现在分词
基本句型
肯定式：I/We have been working.
疑问式：Have you been working？
简略回答:Yes，I/we have. No，I/we haven't. 肯定式
用法 主语+have/has+been+动词-ing(延续性动词)
1.表示从过去某时开始一直持续到现在的动作，并且还将持续下去。

The Chinese have been making paper for two thousand years.

中国有2000年的造纸历史。(动作还将继续下去)

I have been learning English since three years ago.

自从三年前以来我一直在学英语。(动作还将继续下去)

We have been waiting for you for half an hour.

我们已经等你半个钟头了(人还没到，如同在电话里说的，还会继续等)

They have lived in this city for ten years.

他们在这个城市已经住了10年了。(动作还将继续下去)

I have been working here for five years.

我在这里已经工作五年了。(动作还将继续下去)

I have been writing a book.(动作还将继续下去)

我一直在写一本书。

I have written a book.(动作已经完成)

我已经写了一本书。

They have been building a bridge.

他们一直在造一座桥。(动作还将继续下去)

They have built a bridge.

他们造了一座桥。(动作已经完成)

I have known him for years.

我认识他已经好几年了。

She has been sleeping for 6 hours and still cannot wake up.

她已经睡了6个小时，到现在还没有醒来。

It has been raining for 3 days。

已经下了3天的雨了(现在还没停止)