1主语+was/were doing when...2主语+was/were about to do when...3主语+had/hadn't done for some time
问题描述：
1主语+was/were doing when...2主语+was/were about to do when...3主语+had/hadn't done for some time
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答
1.主语+was/were doing when...（过去） .发生时 主语 正在做某事I was doing my homework when she walked in.她进来的时候我正在做作业.2.主语+was/were about to do when...（过去).发生时 主语 将要做某事I was ...