It is a verb (more specifically an infinitive)
The term 'to grow' is a verb phrase (the adverb 'to' modifying the infinitive verb 'grow').Examples:You must water the plant if you expect it to grow.To grow an inch and a half is a lot of growth in a year.
The part of speech for the phrase "of the field" is called a noun phrase. The word "field" is called a noun.
"To them" is a prepositional phrase, where "to" is a preposition and "them" is a pronoun.
The phrase "what part of speech is cake" is a question.
That I am is a phrase, the individual words in the phrase are parts of speech. That -- demonstrative, determiner I -- pronoun am -- be verb
"Will be growing" is a verb phrase. It makes the future progressive tense of grow.
A phrase is never a part of speech, only a word.
Prepositional phrase
The phrase "in addition" is a prepositional phrase in which "in" is the preposition and "addition" is its object. This phrase, as a phrase, is not a part of speech, although it may function as one, probably an adjective or adverb.
A prepositional phrase.
On the mountain top is a preposition phrase, not a part of speech.
That I am is a phrase, the individual words in the phrase are parts of speech. That -- demonstrative, determiner I -- pronoun am -- be verb
adverb phrase
verb
A prepositional phrase.
A prepositional phrase.
A phrase like 'under a vow' is not a part of speech. It is a phrase that is made up of parts of speech. under is a preposition a is an article vow is a noun