英语过去式主要是指发生在过去的动作……记住例句你就可以分辨
1.ago::I was a student three years ago.意思是,我三年前是个学生.这句话首先看有时间状语three years ago,这里边的ago就是很明显的过去式的标志,看到这个单词,就知道用过去式
2.yesterday::I went there yesterday.意思是,我昨天去了那里.这句话时间状语是yesterday,看到这个词,句子绝大部分情况就是用过去式
3.关于英语过去式的一些词总结：ago,yesterday,just now,a moment ago,last year,this moring……等等
4.be 动词的变换形式：在过去式里is要变成was,are要变成were,do要变成did,相应的动词要变成过去式形式（规则动词直接在词后加ed或者双写最后字母再加ed,不规则动词要变成相应形式,如grow——grew,go——went等）
下面是权威介绍
1）关键词：
yesterday,last...,...ago,just now,a moment ago.此外,如果是this morning等也要用过去式,主要看说话的时间和动作发生的时间前后关系.
2）关键句型：
What did...do...
如;What did you do last weekend?
Where was/were ...
如：Where was he yesterday?
Did ...
如：Did you see the film yesterday?
Was/Were ...
如; Was your coat on the bed just now?
3）动词：
a.be动词（was,were）
b.实意动词：go-went,play- played,dance-danced,collect-collected,pick-picked,sing- sang,run-ran,jump-jumped,swim-swam,get-got,drink-drank,eat-ate,draw-drew,fly-flew,make-made,sit-sat等
c.助动词：do-did
4)规则动词的变化形式：
a.直接加ed
b.以不发音的e结尾,加d.如：dance-danced,taste-tasted
c.以一个元音字母加一个辅音字母结尾的重读闭音节动词,先双写结尾的辅音字母,再加-ed.如：stop—stopped
d.以辅音字母加y结尾的动词,先把y变成i,再加-ed.如：study—studied,carry—carried
5）不规则动词的变化形式,大致有这样一些记忆法 ：
a.以t结尾的词,过去式与原形相同.如：put—put,let—let,cut—cut,
b.以d结尾的词,把d变成t.如:build—built,lend—lent,send—sent,spend—spent
c.以n结尾的词,在词后加t.如：mean—meant,burn—burnt,learn—learnt
d.以ow / aw结尾的词,把ow / aw变成ew.如：blow—blew,draw—drew,know—knew,grow—grew
e.含有双写字母的词,将双写改为单写,在词尾加t.如：keep—kept,sleep—slept,feel—felt,smell—smelt
f.含有元音字母o / i的词,将o / i变成a.如：sing—sang,give—gave,sit—sat,drink—drank