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　　Li Ming was ill. He didn’t go to school yesterday. →Li Ming was ill, so he didn’t go to school yesterday.
　　析：本例中，改写前的两个句子之间存在明显的因果关系。这时，我们用并列连词so将其连接在一起，整个含义在表达上就显得紧凑多了，句子间的联系也更加紧密。
　　I do every single bit of housework. My husband Bob just does the dishes now and then. → I do every single bit of housework while my husband Bob just does the dishes now and then.
　　析：原来的两个简单句单独使用时，其对比或比较的语气显得较弱，但使用while这个并列连词将这两个简单句连接在一起构成并列句后，其比较或对比的语气就变得非常地强，更能起到表意的功能(from www.nmet168.com)。
　　Black clouds appear and stain the clear sky. At first they are over the distant forest. Soon the whole village becomes dark. A violent gale comes on. It moves at full speed under the beating, anger, and threat of the clouds.
　　析：这里有五个简单句。如果单纯地使用简单句结构，我们都会觉得文章太单调了。但如果我们在这些句子之间，根据两句之间的逻辑关系，增加适当的并列连词，我们对文章的感觉就会大不一样。请比较增加连词后的这个片段：
　　Black clouds appear and stain the clear sky. At first they are over the distant forest but soon the whole village becomes dark and a violent gale comes on and moves at full speed under the beating, anger, and threat of the clouds.