When to use past participle in English?

In passive voice? be + past participle

In perfect tense? Present perfect tense and de-perfect tense

Past Paticiple, the basic meaning Yes, there are four ways to use it to emphasize what happened in the past:

First: to express completion, have done

I have finished my work. I have finished my work.

Second: Passive, be done

The work is finished. The work is finished. (It only indicates that the work is finished, without emphasizing who did it)

Third: The past participle is adjective-like, used as an adjective, and can be used as a slogan or attributive

He is moved. He is moved. . (He feels passive)

The moved man is my brother. (To be moved is passive)

Fourth: Non-predicate usage

I bought a book written by Mo Yan. I bought a book written by Mo Yan. (The writing was written by Mo Yan)

The past participle of the transitive verb is used as a predicate, and it has a passive relationship with the subject of the sentence, indicating the state of the subject. It not only expresses passivity, but also emphasizes that it has been completed. The cup is broken. The tea cup is broken.

2. The past participle of an intransitive verb is used as a predicate and has an active relationship with the subject of the sentence, indicating the state of the subject and also emphasizing the completion of the action. He is retired. He has retired.

3. When some past participles are used as predicates, the predicate formed is very close to the passive structure.