过去进行时是英语语法中的一个重要时态，表示过去某个时刻正在进行的动作。
- They were playing soccer when it started to rain. （他们正在踢足球，突然下起了雨。）
- I was watching TV when my phone rang. （我正在看电视，手机响了。）
- He was sleeping when the alarm clock went off. （闹钟响了，他正在睡觉。）
- We were driving to the beach when we got lost. （我们开车去海滩，却迷路了。）
- She was cooking dinner when her friends arrived. （她正在做晚饭，朋友们到了。）
- They were studying English when the teacher came in. （老师进来的时候，他们正在学习英语。）
- He was working on his project all night long. （他整晚都在工作他的项目。）
- She was talking to her mom on the phone when she heard the news. （她正在和妈妈通电话，听到了这个消息。）
- They were waiting for the bus when it finally arrived. （他们等了好久，公交车终于来了。）
- We were hiking in the mountains when we saw a bear. （我们在山里徒步旅行时，看到了一只熊。）
- He was playing the guitar when he broke a string. （他弹吉他的时候，弦断了。）
- She was reading a book when the power went out. （她正在看书，电力突然中断了。）
- They were swimming in the pool when the thunderstorm started. （他们正在游泳，雷暴突然发生了。）
- We were watching a movie when the fire alarm went off. （我们正在看电影，火警响了。）
- He was driving to work when his car broke down. （他开车去上班的时候，车坏了。）
- She was taking a shower when her sister knocked on the door. （她正在洗澡，姐姐敲门了。）
- They were enjoying their vacation when it was time to go home. （他们度假的时候，已经到了回家的时候。）
- We were having a barbecue when it started to rain. （我们正在烤肉，突然下起了雨。）
- He was playing video games when he realized he was late for his appointment. （他正在玩游戏，突然发现他迟到了约会。）
- She was studying for her exam when she got a phone call. （她正在为考试复习，接到了一个电话。）
- They were dancing at the party when the music stopped. （他们在派对上跳舞，音乐停了。）
- We were having a picnic when the ants invaded. （我们在野餐的时候，蚂蚁入侵了。）
- He was jogging in the park when he saw his old friend. （他正在公园里慢跑，看见了老朋友。）
- She was shopping at the mall when she found a great deal. （她在商场购物时，发现了一个很好的交易。）
- They were fishing on the lake when a storm rolled in. （他们在湖上钓鱼时，一场风暴来了。）
- We were practicing our presentation when the computer crashed. （我们在练习演讲时，电脑崩溃了。）
- He was walking his dog when it started to snow. （他正在遛狗，突然开始下雪了。）
- She was teaching her son how to ride a bike when he fell off. （她正在教儿子骑自行车，他摔了下来。）
- They were painting the room when they ran out of paint. （他们正在刷房间的时候，油漆用完了。）
- We were playing board games when the pizza arrived. （我们正在玩桌游，披萨到了。）
