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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. (责任编辑：admin) |
