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过去完成时,也叫做过去的完成时态,是英语语法中的一种时态。它用于描述过去某个时间点之前已经完成了的动作或状态。在句子中,过去完成时通常由“had + 过去分词”的形式构成。
以下是一些常见的过去完成时的句型:
肯定句
- I had finished my homework before my parents came home.(我在我的父母回家之前完成了我的作业。)
- She had already eaten breakfast when I arrived at the restaurant.(当我到达餐厅时,她已经吃过早餐了。)
否定句
- They had not studied for the exam before the teacher announced it.(在老师宣布考试之前,他们没有为考试学习。)
- He had not seen that movie before his friend recommended it.(在他的朋友推荐这部电影之前,他还没有看过。)
疑问句
- Had you ever been to New York before your business trip last month?(你上个月的商务旅行前去过纽约吗?)
- Had they finished the project before the deadline?(他们在截止日期前完成了这个项目吗?)
总之,过去完成时是一种非常有用的时态,它可以帮助我们描述过去某个时间点之前已经完成的动作或状态。当我们使用这种时态时,需要注意句子结构和动词形式的正确使用。