平行结构主要包括some/most/many/such/each…, others…; not only…but also…; the former…the latter等。在这种结构中,平行结构两个部分的两个代词经常指代同一对象:前一句中的名词主语。例如,Southwest France in the 1940s, playing children discovered Lascaux Grotto, a series of narrow cave chambers that contain huge prehistoric paintings of animals. Many of these beasts are as large as 16 feet (almost 5 meters). Some follow each other in solemn parades, but others swirl about, sideways and upside down.
Folk-made objects give way to their popular equivalent, usually because the popular item is more quickly or cheaply produced, is easier or time saving to use, or lends more prestige to the owner.