中华考试网中考频道编辑为了给广大考生整理了历年初中英语时态知识点：一般过去时三种变化技巧相关内容，供广大考生参考，希望大家能够取得优异的成绩!

　　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