Consider the following sentence:
We had to go to get a book.
This is how I identify each word or group of words to its corresponding part of speech:
Weis the subject of the sentence.
hadis the auxiliary verb, the sentence is in past tense. The sentence could end here and it is still grammatically correct.
to gois an infinitive acting as an adverb modifying the verb
had. The sentence could also end here and still be grammatically correct.
to get a bookthis is my question. How should I dissect this? If the sentence ends at
to geta person would ask "to get what?" so the noun
a bookis a restrictive component to the word
to get. Is this an infinitive phrase? A compound noun? I don't think it is a preposition either. Did I wrongly approach this structure?