本文提供了几个例子，展示了使用"When... I was doing sth."这个句式来描述过去某个时间点正在进行的动作。
当我们表达过去某个时间点正在进行的动作时，可以使用"When... I was doing sth."这个句式。下面是几个例子：
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当电话响起时，我正在做作业。
"When the phone rang, I was doing my homework."
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当我看到她时，她正在跳舞。
"When I saw her, she was dancing."
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当他们宣布比赛取消时，我们正在准备参赛。
"When they announced the cancellation of the competition, we were getting ready to compete."
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当我打开冰箱时，发现里面已经没有食物了。
"When I opened the fridge, I found that there was no food inside."
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当我正在购物时，突然下起了大雨。
"When I was shopping, it suddenly started to rain heavily."
使用"When... I was doing sth."这个句式可以清晰地表达过去某个时间点正在进行的动作，帮助我们准确地描述当时的情景。