【英语语法】一般过去时

一般过去时表示过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行为；过去主语所具备的能力和性格。基本结构：主语+动词过去式+其他。否定形式①was/were+not;②在行为动词前加didn't，同时还原行为动词；一般疑问句Did+主语+do+其他。

一般过去时（simple past tense)表示过去某个时间里发生的动作或存在的状态，常和表示过去的时间状语连用，如：yesterday，last night，in 1990，two days ago等。
一般过去时也表示过去经常或反复发生的动作，常和often，always等表式频率的时间状语连用。 　　过去习惯性、经常性的动作、行为；过去主语所具备的能力和性格。一般过去时不需考虑三单。

结构：主语+动词过去式+其他

1．直接加ed：work—— worked look——looked play——played, 　　
2．以不发音e结尾的单词，直接加d：live ——lived hope——hoped use——used, 　　
3 以辅音字母+y结尾的，变y为i加ed：study—— studied carry——carried worry——worried, 　　
4以元音字母+y结尾的，直接加ed：enjoy ——enjoyed play——played 　　
5 以重读闭音节结尾的，双写最后的辅音字母+ed：stop—— stopped plan——planned 　　

不规则变化的动词过去式： 　　
have---had are---were get---got say---said feel---felt do/does---did is---was

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