原因在于没有做到以下几点：

高级词汇

高级词汇，指的是大纲中没有列入或没有识记要求，但在实际运用中却频繁出现的词汇，比如：frustration,awkward,awfully,concern等词，都可以算作是“高级词汇”。同学们如果能够适当地运用一些高级词汇，定会给阅卷老师留下深刻的印象。范例：

1. I can’t find any way to solve the problem. (换作高级词汇：I can’t find any solution to the problem.)

2. The question is really difficult to understand. (换作高级词汇：The question is really confusing.)

3. He had to face all the possible difficulties. (换作高级词汇：He had to cope with all the possible difficulties.)

同义词

一些常用的、大家脱口就能说出来的词汇，如：interesting,clever等，在作文中同学都用这些词汇，你如果还用，阅卷老师看到的文章就会千篇一律，枯燥无亮点。如果我们能够熟练地使用它们的同义词，就可以做到与众不同，给阅卷老师带来一丝新意，自然会给多点分。范例：

1. It will be very interesting. (换作同义词：It will be a lot of fun.)

2. He was so clever that he could count all the way up to 100 at one year old.( 换作同义词：He was so smart that he could count all the way up to 100 at one year old.)

3. Last summer I visited New Jersey with my parents. (换作同义词：Last summer I toured New Jersey with my parents.)

短语取代单词

使用短语的难度比单词要大一些，因此适当运用短语更能显出同学们的日常积累和写作功底。范例：

1. Suddenly I had a good idea. (换作短语：Suddenly I came up with a good idea.)

2. Take a moment to see what is happening around you. (换作短语：Take a moment to see what is going on around you.)

3. Everyone should do his or her best. (换作短语：Everyone is supposed to do his or her best.)

运用多语法结构

固定句式(如感叹句、复合结构、强调句型等)、定语从句、现在分词短语等都属于较复杂的语法结构。这些结构的正确使用，可以使文章的语言充满层次感，从而较好地反映写作者的语言运用能力。

一、使用固定句式

范例：

1. She was robbed of her purse but she had no time to call for help.(使用before one can do sth.结构：She was robbed of her purse before she could call for help.)

2. The environment will never improve until everybody takes care of it. (使用倒装结构：Not until everybody takes care of it will the environment improve.)

二、使用现在分词结构

现在分词结构可以表达伴随、原因等状语，因此几乎在任何文章中都可以用得上。现在分词短语可以使句子的表达更加简洁、生动，而且也使前后两个动作的衔接更加紧密。范例：

1. Nowadays, we can easily travel from one place to another and this bridges the gap among different races or cultures. (换作现在分词短语：Nowadays, we can easily travel from one place to another, thus bridging the gap among different race or cultures.)

2. People worked together on the assembly line.(换作现在分词短语：People worked together on the assembly line, moving quickly and efficiently.)

三、使用定语从句

定语从句的使用，不仅能使上下文更加流畅，也同时能充分展示写作者运用较复杂的语法结构的能力。范例：

1. My favorite living writer is Roddy Doyle. I think he is a genius. (使用定语从句：My favorite living writer is Roddy Doyle, who I think is a genius.)

2. My aunt bought me a book. The title of the book is All about USA. (使用定语从句：My aunt bought me a book, whose title is All about the USA.)

上下文连贯

书面表达应该注意“上下文的连贯性”，并能“有效地使用语句间的连接成份，使全文结构紧凑”。这里的连贯性，是指通过连接词(包括并列连词，从属连词和连接性副词)、非谓语动词短语等语法成分，使两个或多个意义相互关联的事情或观点在同一个句子内得以表达，使整个段落或篇章浑然一体，连贯流畅。

一、 连接性副词

连接性副词也被称为过渡词。它们的位置一般以句首居多。连接性副词承上启下，能够令读者对后续的句子产生心理上的期待和准备，因此整个篇章会因它们而紧凑连贯。

常见的连接性副词有：also, furthermore, in addition, additionally, hopefully, meanwhile, however, instead, in other words, in brief, in a word, in my opinion, on the whole等等。范例：

1. We have many things to do. We believe we can finish before the day is over. (使用连接性副词：We have quite a lot to do. Hopefully, we will be able to finish before the day is over.)

2. The boy comes from a poor family. The boy does very well in his studies. The boy plans to work his way through college. (使用连接性副词：Even though he comes from a poor family, the boy does very well in his studies; furthermore, he plans to work his way through college.)

二、 使用从属连词

常见的从属连词有after, as, when, while, as long as, as soon as等。范例：

1. You work hard and never give up. You will succeed in your studies. (使用从属连词：So long as you work hard, you will succeed in your studies.)

2. The teacher came in.The students were quiet. (使用从属连词：The students were quiet as soon as the teacher came in.)

语言得体

一、体裁和题材对得性的要求

不同体裁和题材的文章有不同的用语要求。比如，书面通知中就不适合用“I will tell you a piece of good news.”或“May I have your attention, please?”等句子。这些句子只有在口头通知中才算得体的语句。

高考全国卷曾有一篇书面表达，要求“你”给一位外国朋友回信，介绍“你”帮他找的一套出租房。相当一部分考生没有理解“你”与说话对象的关系，所以话语中没有给对方提出异议的余地，叙述的方式和口吻上缺乏礼貌性，像“The house is very suitable for you.”等语句显得相当主观，若改为“Do you think it is suitable for you? If not, I will try again.”就比较得体。

另外， 英语中还有正式语和非正式语，书面语和口头语之分。写作前，还应该认真分析题目的体裁，根据不同的体裁，确定用语的类别。

正式用语或书面语的句子结构严格遵循语法规则，所采用的单词使用频率不是很高，比如：permit, inform, discover, depart等词都属于正式用语;

而非正式用语或口头用语则较多地使用短语，所采用的单词使用频率高，也比较短。比如let, tell, find out, leave等等。非正式用语也经常使用简略语或缩略词。

二、文化和思想内涵对得体性的要求

只有了解社会、历史、文化、政治及思维习惯等因素对语言的影响，才能使选词更贴切、更得体。例如：

1. People who live on the farm can hear cocks’ crow every morning. (rooster 和cock 都可表示“公鸡”，但cock通常听起来比较粗鲁，所以应把cock改为rooster才比较妥当。)

2. Because he was ill, he had to stay at home yesterday. (本句话想要表达的意思是“因为他病了，所以他不得不呆在家里”。汉语思维中常常是先原因，后结果，而英语则刚好相反。所以句子应该改为：He had to stay at home yesterday because he was ill.)