一.be动词的过去式=was/were
am / is=was
are=were
例：¹he is busy now.（现在式）
²he was busy than.（过去式）
①be动词（过去式）的否定句
例：¹Mr. Brown was a vet.
—Mr. Brown wasn't a vet.（否定）
²Joe and Brian were the living room at that time.
—Joe and Brian weren't the living room at that time.（否定）
②be动词（过去式）的疑问句
例：wendy was in the seventh grade last year.
—was wendy in the seventh grade last year?
回答：Yes,主词＋was / were
No,主词＋was / were＋not
例：were you a pianist?
—Yes, I was. / No, I wasn't.
二.一般动词的过去式=规则变化/不规则变化
①规则变化
原型动词＋ed=helped / spelled /wanted
原型动词字尾有e＋d=love—loved
dance—danced
原型动词为子音＋短母音＋子音=重复字尾＋ed=stop—stopped
原型动词字尾为y的去y＋ied
study=studied cry=cried
②不规则变化
eat—ate / read—read / ride—rode
come—came / go—went / have—had / see—saw / teach—taught
give—gave / take—took
例：¹I walk to school every day.
—I walked to school yesterday.
²mother goes to a supermarket every morning.
—mother went to a supermarket
yesterday morning.
③*主词为第三人称单数时，过去式动词不用＋s,一般动词（过去式）的否定句须用助动词did
例：¹he called you last night.
—he didn't call you last night.（否定）
²my sister and I watched TV all day.
—my sister and I didn't watch TV all day.（否定）［是看了一点 不代表一整天没看］
④一般动词的疑问句
例：¹His friends went to that movie last week.
—Did his friends go to that movie last week?（疑问）
²Grace wrote a letter to David.
—Did Grace write a letter to David?
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