The answer is:
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"To hunt in the park is a serious offense."
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Note: The 'infinitive phrase that functions as the subject is: 'To hunt' .
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He wrote about migrant farmers.
The sentence is a metaphor because "drowning in a sea of grief" means that someone is suffering from a lot of grief, and does not mean that they are literally drowning.
Neither the dog nor the cat _want_ to go outside.
