as many students as it did last year.为什么是did而不是had

原句：The university has twice as many students as it did last year.

为什么是it did last year而不是it had last year?

同意好题老师的分析。下面两句都是对的：

正：The university has twice as many students as it did last year.（did是动词have的过去式替代词）

正：The university has twice as many students as it had last year. （had是动词have的过去式）

如果将 last year 改为 before，则下面两句都是对的（单独使用的 before 可连用一般过去时或现在完成时）：

正：The university has twice as many students as it did before. （did是动词have的过去式替代词）

正：The university has twice as many students as it had before. （had是动词have的过去式）

正：The university has twice as many students as it has had before. （has had是动词have的现在完成时）

波波老师 -

擅长：英语考试 | 采纳率 54% | 回答于 2022-09-05 21:19

默认排序时间排序

其它 2 个回答

好题 2022-09-05 19:18

擅长：英语

had 也可以。但为了不重复，所以换成了 did。

胡德忠 2022-09-05 19:42

擅长：英语

我个人觉得网友的句子不宜用 had，主要是因为句末用了明确的过去时间状语 last year。如果将 last year 换成 before，则可以用 had。