"Was"和"were"都是英语的动词"be"(是)的不同形式，它们在语法上有明显的区别，主要的使用场景是根据主语的单复数来决定。
"Was"是"be"的过去式，主要用于靠前人称单数(I)和第二人称单数(you),以及第三人称单数(he、she、it)。"I was tired yesterday.", "He was sleeping when I called."
而"were"是"be"的过去式，主要用于靠前人称复数(we)、第二人称复数(you)、第三人称复数(they)以及靠前/第二/第三人称与格(he/she/it)。"We were at the park yesterday.", "You were sleeping when I called.", "They were playing soccer when it started raining."
选择使用"was"还是"were"主要取决于主语的单复数以及上下文的语境，希望这个解答能帮到你！
