※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动词之后加not (不)即可。
肯定句：主词+was(were)... 否定句：主词+was(were)+not...
例：1. Mr. Brown was a vet. (Brown先生是一位兽医。） (否定句) Mr. Brown was not a vet. (Brown先生不是兽医。）
= Mr. Brown wasn't a vet.
2. Joe and Brian were in the living room at that time. (那时Joe和Brain在客厅。） (否定句) Joe and Brain were not in the living room at that time.
= Joe and Brain weren't in the living room at that time. (那时Joe和Bram不在客厅。）
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动词放到主词前，句尾加问号(?)即可。肯定句：主词+was(were)... 疑问句：Was(Were)+主词 ?
例：1. Wendy was in the seventh grade last year. (Wendy去年是七年级。)
(疑问句) Was Wendy in the seventh grade last year? (Wendy去年读七年级吗？) ※be动词开头的疑问句，可用yes或no回答。而答句中的主词，须用代名词。
(问句) Was(Were)+主词 ? (答句) Yes, 主词+was(were).
No, 主词+was(were)+not.
例：Were you a pianist? (你是钢琴家吗？) (答句)Yes, I was. / No, I wasn't.
(是，我是。/ 不，我不是。)
一般动词的过去式
一般动词的过去式，分为规则变化及不规则变化。 (1) 规则变化→…ed
例：help→helped (帮忙) spell→spelled (拼字) want→wanted (想要)
例：love→loved (爱)
dance→danced (跳舞)
例：stop→stopped (停止) plan→planned (
计划) 例：study→studied (读书) cry→cried(哭). (2) 不规则变化
例：eat→ate (吃) read→read (读) ride→rode (骑) come→came (来)
go→went (去) have→had (有; 吃) see→saw (看) teach→taught (教) give→gave (给) take→took (拿)
例：我每天走路上学。)