By the end of 2005,it should be reduced by 20%.

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/15 04:48:57

By the end of 2005,it should be reduced by 20%.
有by就一定要用完成时吗?急用,
谁能帮忙找出相关语法内容，

句子是对的.
意思是:到2005年底,它会减少20%
有by就一定要用完成时吗?
这两者没有什么关系.
这里by只是用来修饰20%,意思是减少了多少
如果by改为to,就是减少到原来的20%.
再问：我的意思是用在时间前面的by 比如by the end
再答：抱歉，是我看错了。过去完成时：by the end of＋过去的时间，这里由by引起的时间状语表示到某个时间为止，因此句子的谓语动词需用完成时。

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