定语从句中先行词作主语而且是复数那么从句谓语是用单数还是复数如 the students who _____(have) done their homework （自己编的 )
复数
主谓一致
这是指关系代词在定语从句中作主语时，定语从句中谓语动词的单复数形式与先行词一致的问题。
1、取决于先行词，先行词是单数时，从句的谓语动词用单数；先行词是复数时，从句的谓语动词用复数。
Eg，Mr Smith, who is now downstairs, is asking to see you.
The Smiths, who are now downstairs, are asking to seee you. 2、“one of+可数名词复数”后的定语从句，谓语动词用复数形式；“the only/ very/right one of+可数名词复数”后的定语从句，谓语动词用单数形式。 Eg，Jeff is one of the students who were awarded. 杰夫是当时获奖的学生之一。
Jeff is the only one of the students who was awarded. 杰夫是唯一一个获奖的学生。
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