- The man claimed to be linked to the recent incident. [He claimed, active verb]
There is no auxiliary verb in the sentence above.
It was claimed [dummy subject, passive use of claim]
It was or is claimed (by the authorities) that he was linked to the incident.
The ship docked at the port. [active verb used to distinguish it from some other action].
- The ship sailed through the canal.
- The ship was docked at the port. [passive, meaning: was moored there, who docked it is not given]
- The car was parked in the garage. [passive, it was there, who parked it is not given]
- The car was parked by the chauffeur in the garage. [passive, with agent]
- The ship was docked by the captain but is usually docked by the first mate. [passive,with agent]
In sentences like: the car was parked there, the ship was docked there, the verbs: was parked, was docked refer to the state or condition of a thing but not who performed the action that resulted in their being in that state.
Generally: x was/were + past participle is either a passive sentence or used to describe a state or condition of the subject of the sentence.
When you see who did something to someone or something, that is called the agent.
The car was parked by the chauffeur [agent] in the garage.