本文目录
英语的过去完成时态是一种用来描述过去某个时间点之前已经完成的动作或事件的语法形式。它通常用来描述两个动作或事件的先后顺序，并强调先发生的动作或事件已经完成。
构成
英语的过去完成时态由had加上过去分词构成，例如：
- I had finished my homework before my mom came back.
- They had already left when I arrived at the party.
用法
1.用来描述过去某个时间点之前已经完成的动作或事件。
- By the time I woke up, my sister had already left for school.
- He had read the book before he watched the movie.
2.用来描述过去某个时间点之前一直持续的动作或状态。
- They had been dating for three years before they got married.
- She had been studying English for six months before she took the TOEFL test.
注意事项
1.过去完成时态通常用于两个动作或事件的先后顺序，因此需要注意时间顺序的表达。
2.过去完成时态的否定形式为had not或 hadn't加上过去分词，缩写形式为hadn't。
- She hadn't finished her project before the deadline.
3.过去完成时态的疑问形式为had加上主语加上过去分词。
- Had you ever been to New York before last summer?
总之，过去完成时态是英语语法中非常重要的一种时态，它可以帮助我们更好地表达过去的动作或事件，并准确描述它们的先后顺序。希望这篇文章能够帮助大家更好地理解和应用过去完成时态。
