1、The children were running on the playground as fast as they can.

改：can-could

解释：主句是过去进行时，从句也应该是过去时，保持一致。

2、Since her husband had died, so she had to support her family.

改：把so去掉。

解释：since表示原因，不需要so再来表示结果。两个词不能同时用在一个句子中。

3、He won't go out until his mother will come.

改：will come-comes

解释：主句是一般将来时，until引导的时间状语从句用现在时表示将来，改为第三人称单数。

4、He was very foolish that he didn't pass such an easy exam.

改：very-so

解释：so...that，如此……以至于。

5、Tom had gone out as soon as his mother got home.

改：had gone-gone

解释：主句用一般过去时。

6、It was three months since he came to our school.

改：was-is

解释：从过去到现在的一段时间，用现在时。

7、The platground of our school is larger than their school.

改：加上 that of (their school)。

解释：操场要和操场作比较，不是跟学校比。用that来指代。

8、The streets in Nanjing are wider than Shanghai.

改：those in (Shanghai)。

解释：街道要和街道比较。用those来指代复数的名词。

人教版英语教材是美式英语。

人教版英语教材一般是就教科书意义而言的，相对于其他出版社出版的教科书而言，指的是由人民教育出版社出版的教科书版本。而美式英语较英式英语来说更为口语化，读音开放，有特性。

过去的四百年间，美国、英联邦以及不列颠群岛使用的语言都在不断地发生变化，最终演变成了英式英语和美式英语。两种英语在音标、语法、词汇、拼写、标点、谚语、日期和数字的形式等等许多方面都有不同。

对于人教版的高中英语教材，单词拼写是按照英式英语标准来的，磁带录音用的却是美式英语。阅读材料里比较口语化的语言以美式英语居多。

英文自我介绍可按照如下顺序来进行：个人基本信息About Myself；我有哪些长处About My Strength；我有哪些兴趣爱好About My Hobbies；我的工作经验work experience； 结束语。

In a self-introduction you give information about your name, where you come from, what you are doing, and so on.

在自我介绍中，你给出关于你的名字、来自哪里、职业等信息。

Let me make a self-introduction.

让我做个自我介绍吧。

Be honoured to be able to enter the finals making self-introduction in here very much.

很荣幸能进入决赛在这里做自我介绍。

Well, let me make a self-introduction.

请允许我做个自我介绍。

Hello! Thank you for taking the time to read my letter of recommendation, below, I to a simple self-introduction.

您好!非常感谢您在百忙之中抽出时间来阅读我的的自荐信，下面，我对自己进行一个简单的自我介绍。

Respected Professors, Good afternoon! I'm great honored to meet you here. Now allow me to give a brief self-introduction.

尊敬的老师，下午好!我非常荣幸在这里见到你。现在让我给一个简短的自我介绍。