完整版)英语过去完成时的用法总结

完整版)英语过去完成时的用法总结
The past perfect tense is used to describe an n or state that had already XXX time or n in the past。

It is often referred to as the "past of the past"。

The basic structure of the past perfect tense is subject + had + past participle (vpp) (done).
In a positive sentence。

the structure is subject + had + past participle。

In a negative sentence。

the structure is subject + had + not + XXX。

the structure is had + subject + past participle。

The answer to a yes/no n can be either "Yes。

subject had" or "No。

subject had not"。

In a n。

the structure is wh-word or phrase + had + subject + past participle.
The past perfect tense is used to describe an n or state that had already been completed before a certain time or n in the past。

This can be XXX such as by or before。

or by a past n in the context。

For example。

"By nine o'clock last night。

we had received 200 pictures from the spaceship."
XXX such as "by + past time point"。

"by the end of + past time point"。

or "before + past time point"。

In n。

it is used to describe the "past of the past"。

indicating an n that happened before another n in the past。

This is often seen in object clauses after verbs such as told。

said。

knew。

heard。

or thought。

For example。

"She said that she had seen the film before."
昨天他们已经在10点之前到达了车站。

（强调过去的过去）
XXX。

昨天他们在10点到达了车站。

（只强调过去某一
特定的时间）
2.动作发生的顺序不同：过去完成时用于表示在过去某一
动作之前已经完成的动作，而一般过去时则只表示过去发生的动作，没有先后顺序的限制。

比较：XXX,XXX.我到办公室的时候，他已经离开了。

（强调先后顺序）
XXX.我去了办公室，他离开了。

（没有先后顺序的限制）
3.语态不同：过去完成时可以用于被动语态，而一般过去
时则没有被动语态的形式。

比较：XXX,XXX.我到达的时候，工作已经完成了。

（过去完成时的被动语态）
XXX.我到达之前，他们完成了工作。

（一般过去时没有被动语态）
4.表示意义不同：过去完成时强调“过去的过去”，而一般过去时则只表示过去的动作或状态。

比较：XXX,XXX.到昨天为止，我已经完成了这个项目。

（强调过去的过去）
XXX,XXX.昨天，我完成了这个项目。

（只表示过去的动作）
XXX.
When there is no clear past time adverb to indicate the timing of the n。

the sequence of events should be determined based on the context: the past perfect tense is used for the n that occurred first。

while the simple past tense is used for the n that occurred later。

She was very happy。

Her whole family was pleased with her too。

She had just won the first prize in the XXX.
When two or XXX by "and" or "but," the simple past tense can be used instead of the past perfect tense to indicate the
sequence of events。

nally。

XXX "before," "after," or "as soon as," the past tense can be used instead of the past perfect tense since these ns already indicate the order of events.。