过去完成时态是表示过去某个时间点或事件之前已经发生的动作或状态的英语时态。例句包括：“我们在他到达之前已经离开了”，“我母亲做了晚饭，但我已经吃过了”，“我们去看那部电影之前已经买了票”，“老师已经检查了我们的作业，所以我们可以放心了”，和“她已经去过巴黎了，所以对那个城市很熟悉”。
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我们在他到达之前已经离开了。 We had already left before he arrived.
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我母亲做了晚饭，但我已经吃过了。 My mother had cooked dinner, but I had already eaten.
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我们去看那部电影之前已经买了票。 We had already bought tickets before we went to see the movie.
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老师已经检查了我们的作业，所以我们可以放心了。 The teacher had already checked our homework, so we could relax.
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她已经去过巴黎了，所以对那个城市很熟悉。 She had already been to Paris, so she was familiar with the city.
