雅思小作文常用句型的作用：一方面，使用常用句型能够提高文章的连贯性，帮助考生在有限的时间内完成任务；另一方面，常用句型能够帮助考生在语言表达方面达到一定的水平，让文章更加流利，自然。

常用句型的分类：首先，需要明确的是，常用句型的分类并不是唯一的，以下仅供参考：

1. 表达事实：as far as … is concerned; it is well known that…

2. 表示行程：first and foremost; initially; above all

3. 对比观点：although; despite; however

4. 引用作者观点：according to x,…; in x's opinion

5. 明确表达: undoubtedly; obviously; certainly

需要注意的是，为了避免反复使用同一种句型而被扣分，考生还需要掌握相应句型的替换。

常用句型的注意事项：首先，考生需要灵活运用常用句型，避免过度使用而影响整体质量；其次，应根据不同的题目要求选择相应的句型。

以下是一些例句，供考生参考：

1. 表达明确观点：

Undoubtedly,the ability to communicate effectively is one of the most important skills needed in the workplace today.

2. 对比两种观点：

Despite the advantages of modern technology,many people still prefer traditional methods of communication.

3. 引用作者观点：

In George Orwell's book,'Animal Farm',the author argues that absolute power corrupts absolutely.

4. 表达行程：

First and foremost,it is necessary to analyze the problem before making any decisions.

5. 表达事实：

It is well known that English has become the most widely spoken language around the world.