redo sth
redo 是及物动词，后面直接跟宾语，表示把某事重新做一遍。
She redid her homework before class.
上课前她重做了作业。
重做；再做
redone — past participle of redo · irregular form
改装；[计] 重做
To do something again.
To do again.
一般现在时
I redo my work every day.
我每天都重做我的工作。
一般过去时
He redid the entire project last week.
他上周重做了整个项目。
现在完成时
They have redone the kitchen twice.
他们已重做了厨房两次。
不规则动词，过去式为redid，过去分词为redone。
She redid her homework after realizing the mistakes.
她意识到错误后重做了作业。
用法提示：“redid”是redo的过去式，表示重新做一遍。
I have redone the entire report because the first version was lost.
因为第一版丢失了，我重写了整个报告。
用法提示：“redone”是redo的过去分词形式，作为及物动词使用。
They are going to redo the kitchen floor because it is uneven.
他们打算重新铺厨房地板，因为现在的不平。
用法提示：“redo”用原形表示计划中的重做。
redo 是及物动词，后面直接跟宾语，表示把某事重新做一遍。
She redid her homework before class.
上课前她重做了作业。
使役结构（have/get + 宾语 + 过去分词）表示请别人做某事；这里强调让别人把某事重做。
We had the whole report redone by a native speaker.
我们请一位母语者把整份报告重做了一遍。
need 后接不定式的被动式，表示某事物需要被重做。
This section needs to be redone.
这一部分需要重做。
grammar · medium
易错句子I redoed the whole report last night.
正确表达I redid the whole report last night.
redo 是不规则动词，过去式是 redid（过去分词是 redone），不能按规则动词那样加 -ed 写成 redoed。
grammar · medium
易错句子The teacher told us to redo the test again.
正确表达The teacher told us to redo the test.
redo 本身的意思就是“再做一遍”，已经含有 again 的意思，再加 again 会造成语义重复，删去即可。
grammar · medium
易错句子This exercise needs redo.
正确表达This exercise needs to be redone.
need 后面不能直接跟动词原形；表示“需要被……”时要用 need to be done 或 need doing，因此应说 needs to be redone（也可说 needs redoing）。
重做这项工作
The report was full of mistakes, so I had to redo the work.
报告里错误百出，我只好重做这项工作。
重做作业
The teacher told him to redo his homework over the weekend.
老师让他周末重做作业。
重新计算
The accountant redid the calculations to check the numbers.
会计重新算了一遍，核对那些数字。
从头重做
The first draft was so bad that we decided to redo it from scratch.
第一稿太糟糕了，我们决定从头重做。
把所有事情重做
We lost the file, so we had to redo everything.
我们把文件弄丢了，只好把所有事情重做一遍。
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Dictionary facts from ECDICT, WIKTIONARY.