首先，句子开头的变化目的是让句子变得更多样。它对句子长度的增加，并不那么明显。让我们看个例子：Immediately, the police officer got out of the car and asked for mydriver’s license.，immediately放在句首，可以让句子更多样，看起来富于变化。再看一个例子：Farmlands, However, were less possible to be polluted because offewer factories in the past. 那这句又把however又放在了主语的后边，谓语动词的前边，组成了一个插入语也可以。像这种句首的副词是一种变化方式。
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首先，句子开头的变化目的是让句子变得更多样。它对句子长度的增加，并不那么明显。让我们看个例子：Immediately, the police officer got out of the car and asked for mydriver’s license.，immediately放在句首，可以让句子更多样，看起来富于变化。再看一个例子：Farmlands, However, were less possible to be polluted because offewer factories in the past. 那这句又把however又放在了主语的后边，谓语动词的前边，组成了一个插入语也可以。像这种句首的副词是一种变化方式。