a number of 后面加什么，the number of 后面加什么。

a number of … 意思是 许多……， 后面加名词复数,做句子主语时，谓语用复数。
比如，A number of students are leaving the school.

the number of… 意思是 ……的数量，后面加名词复数,但是作为句子主语时，谓语用单数。
比如 The number of students is 25.

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