一般过去时
（一）动词过去式的构成：
（1）规则变化：
（2）不规则变化：
①过去式不改变：这一类不规则变化的动词都是以-t或者以-d结尾的。
cost—cost cut—cut hit—hit hurt—hurt let—let put—put read—read
keep—kept sleep—slept sweep—swept feel—felt smell—smelt spell—spelt
③以字母-d或者-t结尾、中间的字母组合多数是-ee或者-oo的动词，省略原形动词中两个相同字母中的其中一个。meet—met shoot—shot
④把原形动词的最后一个字母-d改成-t。
send—sent lend—lent rend—rent spend—spent build—built
⑤动词原形中有-ow,-aw这些字母组合的，过去式中把这些组合改成-ew。
blow—blew grow—grew know—knew throw—threw draw—drew
⑥动词原形中有字母组合-in(m)或者-ing或者-ink，过去式中把字母-i变成-a。
begin—began sing—sang ring—rang drink—drank swim—swam
⑦不规则动词以-m,-n结尾的，过去式在原形动词词尾加-t或者-d。
mean—meant learn—learnt dream—dream hear—heard
⑧过去式有-ought, -aught的。
think—thought buy—bought bring—brought teach—taught catch—caught
⑨动词原形是以元音字母-i加辅音字母加不发音的-e结尾的，一般是在过去式中将字母i改成-o。
ride—rode write—wrote drive—drove
⑩动词原形中有-ea或者-ee或者-oo的字母组合的不规则动词，动词过去式是将这个字母组合改成-o，然后在词尾加-e。break—broke speak—spoke choose—chose
(11).动词原形中有字母组合-ay的，过去式改成-aid。say—said pay—paid
（二）一般过去时的各种句式：
stop的过去式是什么肯定句：主语+动词过去式+其他. I watched TV at home last night.
否定句：主语+didn’t+动词原形+其他. I didn’t watch TV at home last night.
一般疑问句：Did+主语+动词原形+其他？Did you watch TV at home last night? →Yes, I did. / N o, I didn’t.殊疑问句：特殊疑问词+did+主语+动词原形+其他？What did you do at home last night?
（三）常见的标志词：just now, a moment ago, last week/night/month/year, yesterday, the day before yesterday…
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