替换是雅思考试考查的其中一个基本能力。而雅思写作的其中一个评分标准lexical resource也要求学生能够有一定学术词汇量并且能做到准确、灵活的替换。很多学生由于词汇量的缺乏，导致部分单词的重复的使用或者替换错误。那么有没有相对比较容易且准确的替换方法呢。其实通过词性的替换，尤其是名词的替换，我们可以既准确又容易地把句子进行改写，使句子学术性得到提升（简单地说就是句子的逼格上去了）。那么这里我们给大家举几个例子：

小作文中的替换相对简单一些，有一些是老师会讲到的固定句型。比如：

A increased from 20 to 25 million dollars in this decade.

这里我们把动词increase变化成名词形式，虽然单词拼写一模一样，但因为词性的变化所以使得整个句子结构也发生了改变：

There was an increase from 20 to 25 million dollars in this decade.

This decade saw an increase to 25 million dollars.

名词化的替换是提升句子学术性的其中一个简单方法。同学们如果平时读国外报刊杂志的时候也可以留意一下这点。这里我们举一些在雅思大作文写作当中能够用到的例子：

1. Local authority preserved a wide area of land from being developed, and this allowed them to create a park.

The preservation of a wide area of land from development allowed local authorities to create a park.

2. If companies continue to burn the forests, they are likely to destroy much of the flora and fauna.

The burning of forests by companies contributes to the possible destruction of local floral and fauna.

3. To maintain staff motivation, companies need to consult with managers before changing their job descriptions

To maintain staff motivation, consultation with managers is needed for companies before the change of employees’ job descriptions.

4. The information age arrived, bringing changes in what people expected, as well as making them uncertain about the future.

The arrival of the information age brought changes in the public expectation and uncertainty about their future.

5. Birds migrate seasonally to another location when food becomes scarce in a habitat.

The seasonal migration of birds to another location is due to the scarcity of food in a habitat.

最后总结一下名词性替换的几个优点：

1. 简单好上手

2. 只是替换词性，能保证替换的准确性

3. 句子更紧凑

4. 由于词性的变化，会使得句子结构、词组、语态等发生变化。使得替换更灵活丰富。