In fact是介词短语，在句子当中一般作状语。例如：The theory seems to have no basis in fact.这一理论似乎没有事实根据。In fact的意思是事实上、（用于修正、引出相反意见或对比等）其实、准确地说等，理论上可以和actually互换。

1、In fact,I think you're right.

事实上，我认为你是对的。

2、Their much reviled system in fact works far better than many highly praised ones elsewhere.

他们那套遭到许多非难的设备操纵起来实际上要比别的地方许多备受赞扬的设备好得多。

3、There is only a formal resemblance between the two systems;they are in fact radically different.

这两种体系只是在表面上有某种相似之处，其实根本不同。

4、In fact,I think an old car is better than none.

事实上，我认为有一辆旧车总比没车强。

5、This famous painting was thought to be by Van Gogh,but it is in fact a forgery.

人们以为这是凡·高的名画，其实是膺品。

6、I think so;in fact,I am quite sure.

我想如此，事实上我非常确信。

7、He pretended not to know her but in fact they were in league(together).

他装著不认识她，其实他们暗中勾结(在一起).

8、He doesn't mind.In fact,he is even pleased.

他不介意，事实上，他甚至很高兴。

1、I didn't fail the exam;in fact I did rather well!

我没有考不及格，事实上，我考得不错！

2、In fact,things could get worse in the short run.

事实上，事情在短期内可能会变得更加糟糕。

3、The theory seems to have no basis in fact.

这一理论似乎没有事实根据。

4、The treatment she received may,in fact,have hastened her death.

实际上，她所接受的治疗可能加快了她的死亡。

5、He thought she was play-acting but in fact she had really hurt herself.

他以为她是装出来的，但实际上她真的受了伤。

6、In fact many food crops failed because of the drought.

实际上，因为干旱，很多粮食作物歉收。

7、In fact,those people have been promoted.

事实上，那些人已经升职了。

8、That sounds rather simple,but in fact it's very difficult

那听来简单，但实际上很难。

9、In fact,the oil companies are already prospecting not far from here.

事实上，石油公司已经在离此不远处进行勘探。

10、Her parents were in fact American by birth.

她的父母在血统上其实是美国人。

11、John Major didn't go to university.In fact he left school at 16.

约翰·梅杰没有上过大学，说白了，他16岁便辍学了。

12、Most people in fact got full marks in one question and zero in the other.

实际上多数人一个问题得了满分，另一个问题却得了零分。

13、This is a common fallacy which has no basis in fact.

这是一个没有事实依据的常见谬误。

14、In fact everything he does is opposite to what is considered normal behaviour.

事实上，他的一切作为都和人们所认为的正常举动大相径庭。

15、Women are in fact still being short-changed in the press.

实际上女性在新闻界仍然没有受到公平对待。

16、The rump of the party does in fact still have considerable assets

事实上，这个党派的残余分子确实仍然拥有可观的资产。

17、You have to admit that you are,in fact,in difficulties

你不得不承认，你事实上是陷入了困境。

18、You weren't to know—in fact,I think I'm the only person who does know.

你不会知道——实际上，我想我是唯一真正知道的人。

19、In fact,the first group were absolutely correct in their estimation of this man's height.

事实上，第一组人对这名男子身高的估计完全正确。

20、The lungs are in fact constructed of thousands of tiny tubes.

肺实际上由上千条细微的气管构成。