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a taxi
a very old one
读者应该不难看出为什么这里我们不能用the，而一定要用a。
（２）
Mary： 〃Hello； this is Mary。 Who is calling？〃
John： 〃Hi； this is John。 How are you？〃
Mary： 〃I am doing fine。 In fact； I am studying for the final examination now。〃
John： 〃Oh； I am sorry。 When will the exam be over？〃
Mary： 〃This Friday。〃
John： 〃Then； can we have dinner Friday evening？〃
Mary： 〃OK； where are we going to eat？〃
John： 〃How about the Chinese restaurant called Four Seasons？〃
Mary： 〃That is all right with me。 When do we meet？〃
John： 〃How about six o'clock？〃
Mary： 〃That's it。 See you Friday evening at 6 o'clock at the Four Seasons。〃
这一篇短文主要的目的在于介绍所谓现在进行式。
Who is calling。
I am doing fine。
I am studying for the final examination now。
都是标准的现在进行式，事实上，也必须用现在进行式。
（３）
I have been interested in music ever since I was a small child。 When I was seven years old； my mother gave me a violin as a birthday present。 I have been taking violin lessons ever since。
I am so much interested in music that I finally decided to go to music school。 This was a hard decision for me。 I consulted with my parents。 Both of them encouraged me to go ahead。
Yesterday； I was accepted by one of the best music schools in Taiwan。 I am really happy about this。
这一段话中，我们开始用现在完成式，比方说第一句话就是
I have been interested in music ever since I was a small child。
为什么要用现在完成式呢？道理很简单，这句话里面有有〝ever since〞这个词，凡是有了这个词句，我们就一定要用现在完成式了。
另外一句用了现在完成进行式的句子是：
I have been taking violin lessons ever since。
读者不妨去看看第四章，就知道为什么这里要用现在完成进行式了。凡是〝自从〞某某日开始，而就一直在做的事情，就应该用现在完成式，或者现在完成进行式。
这一段文章里面，我们还用了被动语气。
I was accepted by one of the best music schools in Taiwan。
各位读者不妨注意，这被动语气的用法是很正当而且适宜的，如用主动这句话变成了
One of the best music schools accepted me。
这样反而并不太能表达原意。
（４）
Before I got into college； I had been to the United States and lived there for one year。 This is why I could speak English better than average students。
As I studied as a college student； Hitler was secretly preparing for the Second World War。 The war erupted finally when I was a senior。 I was forced to quit school and was drafted into the army。 I luckily survived the war and came back to resume my studying after the war was over。 Since I had gone to the war； I was more mature than most of the other students。 Even now； I can still remember my days as a college student as well as a soldier。
这篇文章介绍了如何使用过去完成式，第一句话就用了过去完成式，因为有两件事，一件是〝进大学〞，另一件是〝去过美国〞，由于在进大学以前去美国，所以〝去美国〞就用了过去完成式。
请注意第二段的第一句：
As I studied as a college student； Hitler was secretly preparing for the Second World War。
这一次，我们用了过去进行式，因为有两件事，〝在学校念书〞是一件事，〝希特勒在准备发动第二次世界大战〞是另一件事，其中有一件可以用过去完成式。
同理，在第二段话的最后一句话中，〝曾经去打过仗〞用了过去完成式。
这段文章中，有一句话用了被动语气，读者不妨看这句话〝I was forced to quit school。〞，其实我们在这种情形之下，我们必须用被动语气，当然也可以用主动语气，不过那并不太自然。
也请读者注意这段文章的最后一句话仍一定要用现在式。
（５）
I have been interested in reading novels for a long time。 Among all of the novels that I have read； I like detective novels the most。 Among all detective novels； I especially like those written by Agatha Christe。
Last year； I started reading another kind of novels； namely science fictions。 I found out that some science fiction writers are quite philosophical。 Unfortunately； there are not too many of them。
I always have a dream that one day I will be good in writing novels。 Do you think that my dreams may e true？
这段文章中，我们介绍了动名词的用法，第一句话的reading就是动名词，除此以外，我们还有两处用了动名词：started reading和good in writing。
读者也应该了解为什么第一句话要用现在完成进行式，在第二句话里面，当我们形容novels，我们也用了现在完成式。
请读者注意第一段的最后一句话，those written by Agatha Christe。在这里，written是一个过去分词用作了形容词，形容novels，我们也可以说those which were written by Agatha Christe。
顺便讲一下，Agatha Christe是一位非常著名的侦探小说作者。
也请大家注意，我们只能说interested in reading，而不能说interesting in reading。
（６）
Tomorrow； there will be a dancing party in our university。 Since we are freshmen and most of us have never been to a large dancing party； we are naturally very much excited。 I must say that I am not that excited。 Although dancing is interesting； I often think that the music is too loud。 Besides； as a bystander； I often find the way that the young people dance these days is so funny。 When they dance； they often remind me of monkeys。
Well； I must admit that playing basketball is more interesting to me。 But； unfortunately； I cannot play basketball tomorrow because the courts will be used for the dancing party。
这一段话主要的目的是介绍现分词和过去分词用成形容词的做法。第一个现在分词是dancing，dancing 在这里形容party。
我们在这里看到有些时候，我们应该用现在分词，有时要用过去分词。请看以下的句子：
We are naturally very much excited。
在这里，我们一定要用excited，绝对不能用
＊We are naturally very exciting。
下一句
Although dancing is interesting；
在这里，我们必须用interesting，而不能用interested。也就是说，我们不能说
＊Although dancing is interested。
（７）
We probably all believe that we should love others and forgive those who do bad things to us。 Unfortunately it is often hard for us to practice what we believe in。 For example； if someone really hurts us badly； we just do not know what we should do。 Should we take some kind of action to hurt the person who hurt us； or should we forgive him？
The truth is that we may still seek justice。 It is right if we want a criminal to go to jail for his crime。 Yet； we should never have hatred in our hearts。
这篇文章的目的在介绍〝子句〞的用法，请注意这篇文章内的很多子句，举例来说
that we should love others and forgive those who do bad things。
就是一个子句，这个子句是believe的受词，有趣的是，这个子句内部又有一个子句，那就是
who do bad things to do。
这个子句是形容those的。
以下是这一段文章的全部子句：
that we should love others and forgive those
who do bad things to us
what we believe in
what we should do