第一类：肯定句变否定句
1（be动词类）在表示过去存在的状态的句子中在was, were的后面加上not。
肯定句：He was in the park the day before yesterday.
否定句：He was not in the park the day before yesterday.
2．（行为动词类）要在行为动词的前面加助动词didn’t. 然后把动词过去式改为动词原形。即：didn’t 动词原形
肯定句：She played the violin last night.
否定句：She didn’t play the violin last night.
第二类：一般疑问句
did 主语 行为动词原形
was / were 主语 其他成分
They finished their work at four.
一般疑问句，Did they finish their work at four?
Yes, they did. No, they didn't
第三类: 特殊疑问句
特殊疑问词 did 主语 行为动词原形
They finished their work at four.
如果对动词短语finished their work划线是What did they do at four?
如果对时间at four划线是When did they finish their work?
好了今天就和大家分析到这里了，最后再和大家强调一下，一般过去式是英语中的一个非常重要的语法点，大家一定要弄透了，才算你的语法是合格的，欢迎提出宝贵的意见。
