过去时通常表示在的过去某个时间里所发生的动作或存在的状态。通常在句子里能找到表示过去时间的词或词组。
如：yesterday，yesterday morning，yesterday afternoon，yesterday evening，the day before yesterday（前天），last night，last week，last month， last year，a moment ago（刚才），just now（刚才）， two days ago，a week ago，in 1990等。
如： I went to bed at eleven last night. 昨晚我11：00睡觉。动词过去式的构成规律(一)规则动词的过去式
1．一般情况下，在动词原形后面加-ed；
look→looked play→played start→started visit→visited2．以不发音e结尾的动词，在词尾直接加-d；live→lived use→used
3．以“辅音字母+ y”结尾的动词，先将 y 改为i ,再加 –ed；study→studied, try→tried fly→flied
4．以重读闭音节（即辅音＋元音＋辅音）或r音节结尾，末尾只有一个辅音字母的动词，要先双写这个辅音字母后，再加 –ed。stop→stopped plan→planned, prefer→preferred(二)不规则动词的过去式1．改变动词中的元音；begin→began drink→drank
come→came eat→ate grow→grew
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run→ran know→knew write→wrote get→got 2．变词尾的–d 为–t ；
build→built lend→lent send→sent spend→spent bend→bent3．与动词原形一样；
cut→cut put→put cost→cost hurt→hurt shut→shut4．变-ay 为-aid (少数动词)；say→said pay→paid lay→laid5．采用不同词根；
sell→sold teach→taught buy→bought6．其他。
am/is→was are→were have/has→had do→did过去式句子结构
1．在表示某个时间里存在的状态的句子，系动词用过式was，were构成。
如：（1）I was at home yesterday. 昨天我在家。（2）We were in the gym just now. 刚才我们在体育馆。2．在表示过去某个时间里发生的动作，用动词的过去式构成。如：I visited my uncle yesterday. 昨天我拜访了我的叔叔。3．各种句式
（1）一般过去时的肯定陈述句：主语＋动词过去式＋宾语或表语。
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win→won speak→spoke take→took
He worked in Shanghai ten years ago.（2）一般过去时的否定句：
a．主语＋didn’t＋动词原形＋宾语。(did + not = didn't)He didn't do morning exercises yesterday.
b．主语＋wasn’t/weren’t＋表语。(was + not = wasn't were + not = weren't)
He wasn't an English teacher ten years ago.（3）一般过去时的一般疑问句：a．Did＋主语＋动词原形＋宾语？Did you study English in 1990 ?b．Was/Were+主语＋表语 ？Was he a pupil five years ago ?（4）一般过去时的特殊疑问句：
a．特殊疑问词＋did+主语＋动词原形＋宾语？Where did your parents live five years ago?What did you do last Sunday?b．特殊疑问词＋were/was＋表语？Who was at the zoo yesterday?
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