过去完成时是英语语法中的一种时态，用于表示过去某个时间或某个事件之前已经完成的动作。下面给出20个过去完成时的句子，供大家参考。
- 我们已经到了电影院，但是电影已经开始了。(We had already arrived at the cinema, but the movie had already started.)
- 她已经通知了我，但是我已经错过了这个机会。(She had already informed me, but I had already missed the opportunity.)
- 他已经做完了作业，然后去睡觉了。(He had already finished his homework and then went to bed.)
- 他们已经吃过晚饭了，然后开始讨论计划。(They had already had dinner and then started discussing the plan.)
- 我已经买了这本书，但是我还没有看过它。(I had already bought this book, but I hadn't read it yet.)
- 昨天我已经打电话给你了，但是你没有接。(I had already called you yesterday, but you didn't answer.)
- 她已经去过巴黎了，现在正在计划下一次旅行。(She had already been to Paris and is now planning her next trip.)
- 我已经看过这部电影了，但是我愿意再看一遍。(I had already watched this movie, but I am willing to watch it again.)
- 我们已经在这里等了三个小时了，但是他们还没有来。(We had already been waiting here for three hours, but they hadn't arrived yet.)
- 我已经把这件事告诉了他，但是他还是不相信。(I had already told him about this matter, but he still didn't believe it.)
- 她已经收到了我的邮件，但是还没有回复我。(She had already received my email, but she hadn't replied yet.)
- 我们已经完成了这个项目，现在可以开始新的任务了。(We had already completed this project and can now start new tasks.)
- 他已经忘记了自己的密码，所以无法登录。(He had already forgotten his password, so he couldn't log in.)
- 我已经见过他的父母了，他们很友好。(I had already met his parents, and they were very friendly.)
- 我已经交了申请，但是还没有收到答复。(I had already submitted my application, but I hadn't received a response yet.)
- 她已经准备好了，等着我们出门。(She had already gotten ready and was waiting for us to go out.)
- 昨天晚上我已经关了电视，然后去睡觉了。(I had already turned off the TV last night and went to bed.)
- 他已经读完了这本书，现在正在写读后感。(He had already finished reading this book and is now writing a book review.)
- 我们已经度过了一个美好的假期，现在回到了日常生活中。(We had already spent a wonderful vacation and now returned to our daily lives.)
- 我已经练习了很长时间，所以现在可以背诵这首诗了。(I had already practiced for a long time, so now I can recite this poem.)
