Final answer:
The given sentences are written in passive voice, showing that someone else performed the actions. We can rephrase them using passive voice to indicate this.
Step-by-step explanation:
In these sentences, the verb form used indicates the past participle form of the verb. For example, 'trained', 'watered', and 'had'. When the verb form is 'trained', it shows that someone else performed the action of training the dog. Therefore, we can say 'The dog was trained by a professional'. Similarly, 'The plants were watered by our neighbor while we were away' and 'Her children's pictures were taken by a famous photographer'.