be动词的过去式→was/were
am/is→was、are→were过去式be动词表示“过去时间中发生的状态”例：
- (现在式)He is busy now.(他现在很忙。)
- (过去式)He was busy then.(他那时很忙。)
- (现在式)My parents are at home now.(我父亲现在在家。)
- (过去式)My parents were at home yesterday.(我父母昨天在家。)
时间副词改变，动词也必须改变。
be动词(过去式)的否定句
含有be动词(was、were)的肯定句变为否定句时，在be动词知乎加not即可。例：
- Mr.Brown was a vet.(Brown先生是一个兽医。)
- (否定句)Mr.Brown was not a vet.
- Joe and Brian were in the living room at that time.(那时Joe和Brain在客厅。)
- Joe and Brian weren't in the living room at that time.
be动词(过去式)的疑问句
含有be动词(was、were)的肯定句变为疑问句时，将be动词到主语前，句尾加问号即可。
- 肯定句：主语 +was(were)
- 疑问句：Was(Were)+主语？
例：
- Wendy was in the seventh grade last year.(Wendy去年读七年级吗？)
- (疑问句)Was Wendy in the seventh grade last year?
be动词开头的疑问句，可用yes或no回答。而答句中的主，需用代名词。
答句：
- Yes，主语 + was/were
- No，主语 + wasn't/weren't
一般动词的过去式
一般动词的过去式。分为规则变化和不规则变化。
规则变化：
- 原形动词+ed
- 原形动词字尾有e+d
- 原形动词为子音+短母音+子音→重复词尾+ed
- 原形动词词尾为子音+y→去y+ied
不规则变化：
- eat→ate
- read→read
- ride→rode(骑)
- come→came(来)
- go→went
- have→had(有，吃)
- see→saw
- each→taught
- give→gave
- take→took(拿)
例：
- I walk to school every day.(我每天走路上学。)
- (过去式)I walked to school yesterday.(我昨天走路上学。)
- Mother goes to a supermarket every morning.(妈妈每天去超市。)
- (过去式)Mother went to a supermarket yesterday.
主语为第三人称单数时，过去式动词不加s。一般动词(过去式)的否定句→需用助动词did。
- 肯定句：主语+一般动词(过去式)
- 否定句：主语+did not+原形动词
例：
- He called you last night.(他昨晚打电话给你。)
- (否定句)He did not call you last night。 = He didn't call you last night.
- (否定句)My sister and I did not watch TV all day yesterday. = My sister and I didn't watch TV all day yesterday.
比较：否定句(过去式)be动词：
- She was at home.
- She wasn't at home.
一般动词：
- She studied English.
- She didn't student English.
一般动词(过去式)的疑问句
- 肯定句：主语 + 一般动词(过去式)
- 疑问句：Did + 主语 + 原形动词？
例：
- His friend went to that movie last week.(他的朋友上个星期去看了那部电影。)
- (疑问句)Did his friend go to that movie last week?
- (答句)Yesy,they did. / No,they didn't.
- Grace wrote a letter to David.
- (疑问句)Did Grace write a letter to Davie?
- (答句)Yes,she did. / No,she didn't.
比较：疑问句(过去式)be动词：
- He was sick.
- Was he sick?
一般动词：
He did his homework.
Did he do his homework?
do/does(现)→一般动词-做
did(过)→助动词(+原形动词)
