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在英语的错误中，有两种和标点符号有关。一种是应用逗号却用了句点；另一种应用句点却用了逗号。前种情况使句子不完整；后种情况，则无休止符。 这里就详细谈谈这两个问题。 大家知道，一个完整的句子有主语（The Subject）和谓语（The Predicate）。除了省略句（Elliptical Sentences）之外，一般的句子，都由主语＋谓语组成一个简单句（The Simple Sentence ）。一个短语或分句没有了主句，便是不完整的句子（Fragmentary Sentences），便是错误句。 在下列句子中，①a, ②a, ③a全错；①b, ②b, ③b才对： ①a. I have two purposes of dieting. To save money on food and to trim my waistline. b. I have two purposes of dieting: to save money on food and to trim my waistline. ②a. That desk has a secret drawer. Into which James stuffed all the old bills. b. That desk has a secret drawer into which James stuffed all the old bills. ③a. The old men jumped through the window. Because it was the only way of escaping the fire. b. The old man jumped through the window because it was the only way of escaping the fire. 和不完整的句子呈强烈对照的是只有逗号的句子（Run-on Sentences）。这样的句子，一个接一个，没有句点，也没有连词，这是不对的；因此，④a和⑤a错；④b和⑤b对： | 
