1.主+谓
此结构是描写数据动态变化的首选句型结构，需注意的是主语必须是“数据”比如number, figure, percentage等，不能是其他名词，而谓语动词也只能是不及物动词比如increase, drop等。下面我们来看几个例子：
I.The number of visitors increased sharply between 1995 and 2005 inChina.
II.The percentage of people aged 15-46 dropped slightly by 10% during the 40 years.
III.The figure for college C rose gradually to 30,000 in2002.
IV.The number of aged people over 65 dropped slightly from 1960-1980.
V.The number of aged people over 65 fluctuated between 1 million and 1.2 million from 1940-1950.
2.主+谓+宾
此句型结构的特点在于谓语动词必须是及物动词，比如witness, see等，宾语位置要用表示动态变化的名词比如growth, reduction等，在主语位置上可以仍旧为数据，也可以是地点或者时间段。它对于用主谓结构表达的句子可以作同义转换，比如：
I.The number of visitors saw a sharp increase between 1995 and 2005 inChina.
II.China witnessed a sharp increase in the number of visitors between 1995 and 2005.
III.The years between 1995 and 2005 saw a sharp increase in the number of visitors in China.
3.there + be
此简单句型一般用于对于上述两种动态数据描写句型进行同义转换，be动词的时态一定要根据数据的时间来改变，否则很容易出错：
I.There was an increase in the visits from about 12 to 53 million from 1979 to 1999.
II.There was a sharp rise in the number of visitors between 1995 and 2005 inChina.
III.There was a slight decline in the number of aged people over 65 from 1960-1980.
IV.There was a fluctuation between 1 million and 1.2 million from 1940-1950.
以上就是关于雅思小作文写作方法中表达变化方面的内容，都是一些简单句式和数据的组合。大家可以在备考自己的雅思小作文写作的过程中进行适当的参考和借鉴，以便有更好的备考效果。
