lz总结得真好! 有个问题:主系表结构的句子比较应该与主谓(没有宾语)类的相同吧,不需要系动词。 OG中的例子: OG-118 The question of whether to divest themselves of stock in companies that do business in South Africa is particularly troublesome for the nation's 116 private Black colleges because their economic bases are often more fragile than those of most predominantly White colleges. OG-137 In 1982 the median income for married-couple families with a wage-earning wife was $9,000 more than that for families in which only the husbandthan was employed.
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