Final answer:
To convert 'her father will install it' into passive voice, you switch the object 'it' to become the subject, use the past participle form of the verb 'install,' and include 'her father' as the agent, resulting in 'It will be installed by her father.'
Step-by-step explanation:
The passive voice is used to show interest in the person or object that experiences an action rather than the person or object that performs the action. In other words, the most important thing or person becomes the subject of the sentence.
The sentence 'her father will install it' in passive voice would be 'It will be installed by her father.' When converting sentences from active to passive voice, the object of the active sentence becomes the subject of the passive sentence.
The main verb is turned into the past participle form, and the original subject becomes the agent, preceded by the word 'by' in passive constructions. In this case, 'it' is the object being acted upon and 'her father' is the agent doing the installation.