摘要：像before，formerly, previously这样的时间副词以及像in the past, in the past few years 这样的介词短语,并不是表示过去的某个时间点,而是从现在开始追溯到过去的某个时间点的一段时间，可以和完成时态连用。（

像before，formerly, previously这样的时间副词以及像in the past, in the past few years 这样的介词短语,并不是表示过去的某个时间点,而是从现在开始追溯到过去的某个时间点的一段时间，可以和完成时态连用。（在间接引语句中常常用过去完成时）

例:

My brother has never been abroad before. ( New Concept English, Book 2, Lesson 4)

我的兄弟以前从没有去过国外。

I have never written a play before.

我以前从没写过剧本。

Am I right in thinking we've met before?

我们以前见过面，我说得对吗？

Something ought to have been done before now.

先前就该采取措施了。

He has been unhappy for a long time, but I've never seen him so unhappy before.

好长一段时间他都不高兴,但是以前我从没见到他这样不愉快。

I've never heard that word before.

我以前从没听到过那个词。

I learnt that the house had formerly been an inn.

我得知这座房子以前是家客栈。

He had formerly been in the Navy.

他从前在海军服役。

The old railway station, which I had formerly visited as a child, has been transformed into a cultural center.

那座我儿时曾参观过的老火车站，现已改建成文化中心。

She has formerly worked as a journalist, but now she has founded her own media company.

她曾做过记者，如今已创办了自己的传媒公司。

By the time the new policy was implemented, the company had formerly struggled for several years under the old system.

在新政策实施时，这家公司在旧体制下已苦苦挣扎数年。

he artist, who had formerly studied traditional painting, surprised everyone by creating avant - garde sculptures.

这位曾研习传统绘画的艺术家，因创作先锋雕塑而令众人惊叹。

The research team, which has formerly been exploring this field for a decade, finally achieved a breakthrough.

这个在该领域持续探索十年的研究团队，终于取得了突破。

They have formerly been living in a small town but now they've moved to the city for better opportunities.

他们之前一直住在一个小镇上，但现在为了更好的发展机会搬到了城市。

The ancient manuscript, which had formerly been hidden in a monastery, has now been digitized for public access.

这份曾藏于修道院的古老手稿，现已被数字化以供公众查阅。

He has formerly held several senior positions in multinational companies and has now started his own business.

他曾在多家跨国公司担任高级职位，如今已创业。

The technology, which had formerly been restricted to military use, has been widely applied in civilian industries over the past decade.

这项曾仅限军用的技术，在过去十年中已广泛应用于民用领域。

She had previously worked as a journalist before becoming a novelist.

在成为小说家之前，她曾当过记者。

The research has previously been published in a scientific journal.

这项研究此前已发表在一本科学期刊上。

He had previously stated his position on the issue.

他此前已表明过自己在这个问题上的立场。

The software, which has previously been updated three times, now runs more smoothly.

这款软件此前已更新三次，现在运行更加流畅。

They have previously visited this museum, so they can guide us through.

他们之前来过这个博物馆，所以能给我们当向导。

By the time she arrived, the team had previously completed most of the project.

她到达时，团队此前已完成项目的大部分工作。

The historian, who had previously studied medieval manuscripts, made a groundbreaking discovery.

这位此前研究中世纪手稿的历史学家，有了一项突破性发现。

The research group has previously been working on this topic for five years and is close to a solution.

该研究小组此前已就这个课题持续研究五年，目前接近得出结论。

She has previously been training for the marathon every morning, and her endurance has improved significantly.

她此前每天早上都在为马拉松训练，耐力已显著提升。

She has previously noticed his lingering glances, and now she finally understands his feelings.

她此前就留意到他缠绵的目光，如今终于明白了他的心意。

They had previously exchanged countless messages, but their first face - to - face meeting was still nerve - wracking.

他们此前已聊过无数信息，但第一次面对面时依然紧张不已。

Having previously dated people who didn't understand her, she cherishes this relationship more than ever.

此前交往过不理解她的人，她比以往任何时候都珍惜这段感情。

They had previously argued over trivial matters, but this time they decided to communicate sincerely.

他们此前常为琐事争吵，但这次决定坦诚沟通。

She has previously avoided discussing her past traumas, but now she's ready to open up to him.她此前一直回避谈论过去的创伤，如今却愿意向他敞开心扉

The couple has previously weathered financial crises and family disputes, making their bond unbreakable.

这对夫妻此前共同度过了经济危机和家庭矛盾，感情牢不可破。

The hypothesis, which has previously been tested in several experiments, requires further validation.

这个此前已在多项实验中验证过的假设，仍需进一步证实。

By the end of last quarter, the team had previously completed two major milestones.

截至上季度末，团队此前已完成两个重要里程碑。

The technology, which has previously been used only in laboratory settings, is now ready for commercialization.

这项此前仅用于实验室环境的技术，现已具备商业化条件。

My children have wounded me in the past.

我的孩子们过去曾伤害过我。

The group has been notoriously fickle in the past.

这伙人过去一直是出了名的善变。

Students have played an important role in the past, but for the moment, they're on the margins.

学生过去曾经发挥了重要的作用，不过现在他们变得无足轻重了。

In the past we have heard only negatives when it came to following a healthy diet.

说到遵循健康饮食习惯，我们过去听到的都是否定的说法。

I've had my share of luck in the past.

以前，命运也不算亏待我。

I've had my fair share of success in the past.

过去我已经取得了应有的成功。

In the past this process of transition has often proven difficult.

过去这一过渡过程常常很艰难。

Real wage costs have risen by 10% in the past year.

在过去的一年里，实际工资成本增加了10%。

Two thirds of the region has been deforested in the past decade.

在过去十年里这个地区的森林有三分之二被毁掉。

I haven't seen much of her in the past few weeks.

近几周来我很少见到她。

Women have become more assertive in the past decade.

女性在过去十年中已变得更加自信。

More than 70 000 shopkeepers have been forced to put up the shutters in the past year.

去年，有7万多家商店被迫关了门。

We've previously tried every coffee shop in the neighborhood, and this one is still the best.

我们之前试过这附近的每一家咖啡店，这家依旧是最棒的。《老友记》

Jon Snow had previously fought in many battles, but this one would be the most crucial.

琼恩·雪诺此前经历过许多战斗，但这一场将是最为关键的。《权力的游戏》

Walter White has previously been struggling with cancer and teaching chemistry, but now he's on a dangerous path. 《绝命毒师》

沃尔特·怀特此前一直在与癌症抗争并教授化学，如今却走上了一条危险的道路。

We've previously promised each other forever, and nothing can break us apart.

我们此前已向彼此许诺永恒，没有什么能将我们分开。《恋恋笔记本》

We had previously dreamed of a perfect marriage, but reality taught us different lessons.

我们此前曾梦想完美婚姻，可现实给了我们不同的教训。《婚姻故事》

来源：翅膀英语