句子成分分析（表语的判断）

While I was at the booking office buying a ticket, father saw to my luggage.

请问各位老师，I was的表语是at the booking office还是buying a ticket呢？

at the booking office是介短作表语，buying a ticket是现在分词作状语

may52014 - 学生

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黎反修 - 英语翻译（已退休） 1秒前

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While I was at the booking office buying a ticket, father saw to my luggage.

在这个句子中，at the booking office 是地点状语，was buying 是过去进行时作谓语，a ticket 是was buying 的宾语。句中没有表语。