一课一题一语法：新概念英语第2册第52课
Hello，大家好！欢迎来到“新概念英语的教与学”！我是上海时学教育的钟老师。
【往期回顾】
下面是我们每周一课一题一语法的分享时间，先来公布上一期课后一题的答案及简析：
【本期内容】
下面我们继续本周《新概念英语2》第52课的重点句型或语法的分享。先来读一读课文：
一、课文原文
Lesson 52 A pretty carpet
We have just moved into a new house and I have been working hard all morning. I have been trying to get my new room in order. This has not been easy because I own over a thousand books. To make matters worse, the room is rather small, so I have temporarily put my books on the floor. At the moment, they cover every inch of floor space and I actually have to walk on them to get in or out of the room. A short while ago, my sister helped me to carry one of my old bookcases up the stairs. She went into my room and got a big surprise when she saw all those books on the floor. 'This is the prettiest carpet I have ever seen,' she said. She gazed at it for some time then added, 'You don't need bookcases at all. You can sit here in your spare time and read the carpet!'
——选自《新概念英语》第二册，外语教学与研究出版社，1997年10月第1版
本课主要学习现在完成时和现在完成进行时区别：
现在完成时的结构：主语+ have / has + V过去分词
现在完成进行时结构：主语+ have / has + been +doing
（二）常见用法
1、现在完成进行时是第二册新增的时态。主要用于表示过去发生的动作持续到现在，而且还会继续持续下去。
例如：
I have been working hard all morning.
我一个上午都一直努力地工作。
She has been trying to get her new room in order.
她一直试着让她的新房间整洁有序。
2、现在完成时表示过去发生的动作对现在造成的影响或结果。动作可能已经结束，也可能继续持续下去。
例如：
I have learned English for ten years. (该动作可能会持续)
我学英语已有10年了。
He has been to Japan twice. (该动作已经结束)
他曾去过两次日本。
根据本课的重要语法点，让我们来练一练吧，请选择正确的选项。
It ______ hard since yesterday and it is still raining.