1、perform的过去式是performed。
2、performed：英[pe'fo:md]，美[per'fo:rmd]。v.做; 履行; 执行; 演出; 表演; 工作，运转(好 / 不好)。
3、例句：He performed a simulated striptease.他模仿了一段脱衣舞表演。
技巧
一变:肯定句变为否定句
【技巧1】当句中含有情态动词或助动词could，would，should等时，可直接在其后面加not构成否定句。例如:
I could get you a concert ticket. → I could not / couldn't get you a concert ticket.
【技巧2】当句中含有系动词was，were 时，可直接在其后加not构成否定句。例如:
I was on the Internet when you called me. → I was not / wasn't on the Internet when you called me.
【技巧3】当句中谓语是除情态动词、助动词、系动词was,were以外的动词时，在该动词之前加did not / didn't，动词还原，构成否定句。例如:
The famous singer sang some Chinese songs. → The famous singer did not / didn't sing any Chinese songs.
二变:陈述句变为一般疑问句
【技巧1】移动词语的位置。将was，were,could，would，should等移到句首。例如:
He could pack his things himself. → Could he pack his things himself?
【技巧2】添加助动词did。谓语是除情态动词、助动词、系动词was,were以外的动词时，在主语之前加did，动词还原。例如:
Mr Li looked very old. → Did Mr Li look very old?
三变:陈述句变为特殊疑问句
【技巧1】确定疑问词:人who / whom，物what，地点where，时间when / what time，原因why，频率how often，长度how long，距离how far等等。例如:
They gave the concert last night. → When did they give the concert?
【技巧2】辨认结构形式:疑问词+情态动词/助动词/ was / were / did +主语+...? 例如:
The accident happened near the station. → Where did the accident happen
一些不规则变化:
do>did see>saw make>made take>took eat>ate
read>read put>put get>got hear>heard feel>felt
is/am---was are---were teach---taught catch---caught
buy---bought go---went come---came become---became等
