参考：无忧英语51talk梁颖老师的超实用语法20讲在线课程第3-4课
lesson 3时态 ：一般过去时
形式：动词过去式, 如did
例子：
yesterday once more
when I was young, I'd listen to the radio, waiting for my favorite songs.
when they played, I'd sing along. it made me smile.
those were such happy times and not so long ago.
how I wondered where they'd gone.
but they are back again, just like a long lost friend.
all the songs I love so well.
动词变化规则：
一般情况+ed, played, worked, looked
不发音的e+d, lived, saved, wiped
辅音+y结尾，变y为i+ed, studied,
重读闭音节，辅元辅，双写末尾+ed, planned, stopped,
动词不规则变化：详见本文末尾不规则动词变化表
read--read, write--wrote, go--went, fly--flew, run--ran, do--did, throw--threw, sell--sold, teach--taught, hurt--hurt, catch--caught, spend--spent, buy--bought
常见用法：
1)客观陈述过去发生的事
he goes to the supermarket everyday。一般现在时
he went to the supermarket yesterday.
he bought a computer last week.
I went to London in 2003.
I was a naughty boy.
I thought he was a soldier.
I expected he could win.
I knew it.
2)过去重复的动作或习惯
when I was a child, I went to the toy shop every week.
she stayed up late on Sundays.
when I was young, I watched the program everyday.
词组：used to do/didn't use to do过去(不）常常
she used to play tennis every Sunday.
Frank was the head of a very large business company.
but as a boy he used to work in a small shop.
I used to be the shortest student of my class.
I used to watch a movie on Friday.
错误形式：I used not to eat carrots.
I didn't use to eat carrots.
词组：be used to doing习惯于
I am used to getting up at 5:30 every day.
3)委婉的语气/礼貌
I wondered if maybe you wanted to go to the ball with me.
Would you please sign here?
Could you show me the way to the museum?
练习：
If you don't like the drink you ordered, just leave it and try a different one.
--that must have been a long trip.
--Yeah, it took us a whole week to get there.
When I got on the bus, I realized I had left my wallet at home.
2.how did you learn to drive? my father taught me.
3.we couldn't afford to keep our car, so we sold it.
4.Dave fell down the stairs this morning and hurt his leg.
5.Joe threw the ball to Sue, who caught it.
6.Ann spent a lot of money yesterday. she bought a dress which cost 100 pounds.
常见不规则动词变化形式：
AAA型【过去式、过去分词与原形一致】，如
cut-cut-cut（切、割）
shut-shut-shut（关、闭）
put-put-put（放置）
let-let-let（让）
hit-hit-hit（撞击）
ABB型【过去式与过去分词一致】，如
buy-bought-bought（买）
think-thought-thought（想；认为）
catch-caught-caught（抓住；接住）
teach-taught-taught（教；教书）
lend-lent-lent（借出）
ABA型【过去分词与原形一致】，如
run-ran-run（跑步；逃跑）
come-came-come（来）
become-became-become（成为）
ABC 型【过去式、过去分词、原形不一致】，如
begin-began-begun（开始）
drink-drank-drunk（喝；饮）
ring-rang-rung（铃响；打电话）
swim-swam-swum（游泳）
know-knew-known（知道）
