“Be doing when...” 句型详解
在英语学习中，“be doing when...” 是一个非常实用且常见的句型，用于描述**在过去某个时间点正在进行的动作被另一个突然发生的动作打断**。它结合了 过去进行时 和 一般过去时，是表达“正在……突然……”情境的核心结构。
一、基本结构
主语 + was/were + 动词-ing + when + 主语 + 一般过去时动词...
- was 用于第一人称单数（I）、第三人称单数（he, she, it）
- were 用于第二人称（you）及复数主语（we, they）
二、用法说明
该句型强调：在某事正在进行中，另一件事突然发生。其中：
- “be doing” 表示背景动作（持续、未完成）
- “when + 一般过去时” 表示打断动作（瞬间、已完成）
三、经典例句
I was cooking dinner when the phone rang.
They were playing soccer when it started to rain.
She was reading a book when her brother came in.
We were watching a movie when the power went out.
He was walking home when he saw an accident.
四、常见错误提醒
- ❌ 错误：I cooked when the phone rang.
✅ 正确：I was cooking when the phone rang.
- ❌ 错误：When I was cooking, the phone is ringing.
✅ 正确：When I was cooking, the phone rang.
五、小练习（自测）
试着用“be doing when...”完成以下句子：
- I __________ (study) when my friend __________ (call).
- They __________ (drive) when they __________ (see) a deer.
答案：1. was studying, called 2. were driving, saw