掌握过去完成时 (Had done) 的事件先后顺序。 Master Past Perfect sequencing (Had done) for earlier actions.
识别并正确应用过去完成时所需的过去参考点。 Identify and apply the necessary past reference point.
构建将来完成时 (Will have done) 的句子结构。 Construct sentences using the Future Perfect Tense (Will have done).
整合多时态（过去，现在，完成）的复杂时间线结构。 Integrate multiple tenses into complex timeline structures.
重点: 利用 'By the time' 等时间短语作为精确排序的触发器。 Focus: Utilizing time phrases like 'By the time' as precise sequencing triggers.
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