20年前英文？20年前,这里到处是平房 翻译：20 years ago, there used to be (或者there were) low houses all over the place.满意请及时采纳，那么，20年前英文？一起来了解一下吧。
用by
By the year 2020, green house gas will be reduced by 20%.
Greenhouse gases will have been cut by 20% by 2020.
是以现在为时间点持续到将来某点结束，严格来说用将来完成时。谢谢
请问二十多年前
I would like to ask more than and 20 years ag
请问二十多年前
I would like to ask more than and 20 years agoo
by 2020
By 2020, the greenhouse gas emission will be cut/reduced by 20%.
20 years ago, there were single-storey houses everywhere.
以上就是20年前英文的全部内容，20 年后 after 20 years 或 in 20 years 20 年内 within 20 years 或 in 20 years （与此可见 in 20 years 有两个意思， 正确意思要看上下文。）in the past years 前几年， 以前的几年 over the past years 在前几年里 in the last years 在。的最后几年。
