过去完成时表示在过去某个时间点之前已经完成的动作或状态。例如,“在我出门上班之前,我已经吃过早饭了。”、“他们在决定要孩子之前已经结婚5年了。”等。掌握这些常用的过去完成时例句能够帮助我们更好地理解和运用过去完成时。
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I had already eaten breakfast before I left for work. (在我出门上班之前,我已经吃过早饭了。)
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They had been married for 5 years before they decided to have children. (他们在决定要孩子之前已经结婚5年了。)
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The flight had been delayed for 2 hours before it finally took off. (这架飞机在最终起飞前已经晚点了两个小时。)
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She had studied English for 3 years before she moved to the United States. (在她搬到美国之前,她已经学了三年英语了。)
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He had finished his homework by the time his friends arrived. (在他的朋友到达之前,他已经完成了作业。)