英语一般过去时在什么情况下用did/什么情况下用were /was

were /was 分别是be动词are/am的过去式,后面接形容词做表语,获接名词做宾语.
were是复数形式,主语只能用we,we were good,或 we were students.
was是单数形式,主语只能用I,I was good,或 I was a student.
did是动词do的过去是,主语可以是单数也可以是复数,you,he/she,they,it等都可以做主语
they did well,副词well 可以用来修饰did
they did a good thing,后面可以接名词.

单数用did
复数用WAS

额。。。。这个问题貌似有点问题。。
这个动词的选择要看句子中具体需要什么动词

用于物是did,用于人称代词后用be动词的过去时态。多看点语法书，多观察书本课文里的句子结构，多背点有价值的句子。学好语法真的很重要的，要加油哦！