过去完成时的语法练习

过去完成时用于表示在过去某个时间点之前已经完成或发生的事件或动作。它由助动词 have 或 had 加上过去分词构成。

过去完成时的语法练习

规则：

肯定句：

have/had + 过去分词

否定句：

have not/had not + 过去分词

疑问句：

Had + 主语 + 过去分词

练习：

将下列句子转换为过去完成时：

1. 他昨天早上醒来时已经吃了早餐。 2. 我完成作业之前已经检查了语法。 3. 比赛开始时，他们已经热身了。 4. 我到家时，她已经做了晚餐。 5. 当我打电话时，他已经离开了。

答案：

1. 他昨天早上醒来时 already eaten 早餐。 2. I checked the grammar before I finished the homework. 3. They had already warmed up when the game started. 4. She had already made dinner when I arrived home. 5. He had already left when I called.

练习：

用过去完成时完成下列故事：

约翰和玛丽相约在公园见面。然而，当约翰到达时，公园里空无一人。他打玛丽的电话，但没人接。突然，他意识到玛丽已经离开，而他已经 missed 他们的约会。

答案：

John had arrived at the park, but it was empty. He called Mary's phone, but there was no answer. Suddenly, he realized that Mary had already left and that he had missed their appointment.

练习：

选择正确的过去完成时形式来完成句子：

1. 当我 ____ 时，他 ____ 在等了。（arrive, had waited） 2. 我 ____ 所有的事 ____ 时，他们 ____ 离开了。（finish, had already left） 3. 她 ____ 这本书 ____ 时，我 ____ 打电话给她。（read, had finished, called）

答案：

1. arrived, had waited 2. finished, had already left 3. read, had finished, called