is的过去式是was，过去分词是been。was是be的第一和第三人称单数过去式。been是be的过去分词形式，作为动词，中文含义为“是”。been用在完成时和被动句中，其中现在完成时的构成为has/have+been/done，过去完成时的构成为had+been/done，当被动句的主语是物时，即用被动语态。例句：The first part of the plan has been safely accomplished.计划的第一部分已顺利完成。

had been.已经；一直是；（过去完成时态）

there have been.已有；一直存在

have been in.已经在；已经

must have been.必须已；必须已经；必须已在

have been to.去过；已经去过

have been doing.一直做；已经做

have been there.一直有；去过那儿；到过那里

how have you been recently.你最近怎么样

1、You are been in love,you know what it's like.

只要你曾经爱过，就一定知道恋爱的滋味。

2、It has been said that man is a rational animal.

有人曾经说，人是理性的动物。

3、By the time you get there the meeting will be over.

等你到了那里的时候，会议就该结束了。

4、There have been some problems but basically it's a good system.

虽然出现过一些问题，但这基本上仍不失为一个好系统。

5、It's been quite a day,one way and another.

从几方面看，这是不寻常的一天。

6、By this time next week we'll be in New York.

下星期的这个时候我们将在纽约。

7、There are only so many hours in a day.

一天不过这么几个小时。

8、Teachers are up against some major problems these days.

老师们最近面临着一些重大问题。

9、The new methods are radically different from the old.

新的方法迥然不同于旧的方法。

10、The blood samples are sent to the laboratory for analysis.

血样要送往实验室进行分析。

11、£50 should be enough to be going on with.

50英镑该够应付一时半会儿的了。

12、Would now be a suitable moment to discuss my report?

现在讨论我的报告合适不合适？

13、Customers are thin on the ground at this time of year.

一年里这个季节顾客很少。

14、No new SARS cases have been reported in the region.

该区没有新增非典型肺炎病例。

15、They are in work.

他们有工作。

1、The system was down all morning.

系统整个上午都无法运行。

2、The art collection was his life's work.

收集艺术品是他一生的工作。

3、People used to think the earth was flat.

人们曾经认为地球是平的。

4、I thought it was a very bad article.

我以为那是一篇很低劣的文章。

5、There was just one small ray of hope.

只有一线希望。

6、In the light of later events the decision was proved right.

从后来发生的事看，这一决定证明是正确的。

7、The pilot was given clearance to land by air traffic control.

飞行员得到空中交通管制站发出的着陆许可。

8、She was not only intelligent but also very musical.

她不仅聪明，而且极具音乐天分。

9、The cost is about half as much again as it was two years ago.

现在的价格比两年前提高约一半。

10、He was taken to the hospital during the night.

他在夜间被送到医院。

11、I was feeling fine when I got up this morning.

今天早上我起床时感觉很舒服。

12、She was still half asleep when she arrived at work.

她到了上班地点时仍然睡眼惺忪。

13、There was no change in the patient's condition overnight.

病人整夜病情不变。

14、There was a lot of background noise.

背景噪音很多。

15、Was I pleased to see the back of her!

真高兴不会再见到她了！