The Washington Monument was completed in 1884 since its ground breaking in 1848.需要解释和语法知识语法知识就since后面那句就可以了、就是为什么since后面用的不是过去式，

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The Washington Monument was completed in 1884 since its ground breaking in 1848.需要解释和语法知识语法知识就since后面那句就可以了、就是为什么since后面用的不是过去式，
The Washington Monument was completed in 1884 since its ground breaking in 1848.需要解释和语法知识
语法知识就since后面那句就可以了、就是为什么since后面用的不是过去式，

The Washington Monument was completed in 1884 since its ground breaking in 1848.需要解释和语法知识语法知识就since后面那句就可以了、就是为什么since后面用的不是过去式，
这句话没问题
你这句话since 后面的部分的这种写法不构成一句话,是一个长的修饰结构,所以不存在你说的什么过去式的问题.
举个相同的例子：
since my born in 1990,i have learnt a lot of things.自从我1990年出生,我已经学了很多东西.
这个since的用法和你上面的一样.
你那句里面的ground breaking 就跟上面这句的born的成分一样.
只不过,严谨的书面英语,应该写成ground-breaking,”奠基“,在这里是一个名词,就跟”自从我的出生“ 里的 ”出生“ 所在的结构一样.

我认为该句有问题
since 引导的是原因状语从句应该是since its ground was broken in 1848.

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这句话没问题
你这句话since 后面的部分的这种写法不构成一句话，是一个长的修饰结构，所以不存在你说的什么过去式的问题。
举个相同的例子：
since my born in 1990, i have learnt a lot of things. 自从我1990年出生，我已经学了很多东西。
这个since的用法和你上面的一样。
你那句里面的ground breaking 就跟上面这句的born的成分一样。
只不过，严谨的书面英语，应该写成ground-breaking，”奠基“，在这里是一个名词，就跟”自从我的出生“ 里的 ”出生“ 所在的结构一样。

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