It is a long walk to school.
(What does 'It' refer to? What does 'to school' modify in the sentence? Is 'to school' an adverbial phrase?)
English - Writeacher, Monday, March 26, 2012 at 6:16am
"It" is just one of those generic uses that doesn't refer to any particular noun. This construction also occurs in these:
It's very hot today.
It's raining cats and dogs outside.
It's a great day for a picnic.
Yes, "to school" is an adverbial use of the infinitive in this sentence.