I,he,she,it => was 第一及第三人称单数
简单过去式
I was tired yesterday.
She/He/It was tired yesterday.
过去进行式
I was walking in the park when the phone rang at home yesterday.
She/He/It was walking in the park when the phone rang home yesterday.
We,you,they => were 第一、第三人称众数 及第二人称单数及众数
简单过去式
We/They were exhausted after a full day's training.
You alone were exhausted after a full day's training.
You all were exhausted after a full day's training.
过去进行式
We/You/They were walking in the park when the phone rang at home yesterday.