看外国的语法书在提到疑问词引导的名词从句作主语,都讲谓语动词用单数:
What were left behind ... five empty bottles.
这类例子,请问这类句子谓语动词可以用单数吗?
what在此不是疑问词,而是融合型关系代词。what=the thing or things that, 引导的是名词性关系分句。从What were left behind这个分句中动词用were,可知what在此是the things that,即复数意义,所以,主句的谓语动词也应该用were,而不能用was。
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