was 和 were 在肯定句、否定句和疑问句中的用法不同。
肯定句
- 主语为 I, he, she, it 时使用 was：I was at the library yesterday. 1
- 主语为 we, you, they 时使用 were：They were at the party last night. 1
否定句
- 在 was 后加 not：She was not at home. 2
- 在 were 后加 not：They were not at the party. 2
疑问句
- 将 was 提到句首：Was she at home? 2
- 将 were 提到句首：Were they at the party? 2
