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1）当there be 句型的主语是一系列事物时，谓语应与最邻近的主语保持一致。 There is a pen， a knife and several books on the desk There are twenty boy-students and twenty-three girl-students in the class. 2）当either or 与neither nor， 连接两个主语时，谓语动词与最邻近的主语保持一致。 如果句子是由here， there引导，而主语又不止一个时，谓语通常也和最邻近的主语一致。 Either you or she is to go. Here is a pen， a few envelops and some paper for you. | 
