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An infinitive phrase consists of "to + simple form of the verb". It can function either as a noun, adjective or adverb. In the given sentence above, the infinitive phrase is option B. to go on a field trip. This phrase consists of "to" plus the simple verb "go" and then the complements. 

The infinitive is present in the expression "to go on a field trip."

What is the infinitive?

  • It is the verb in its nominal form.
  • is the verb presented without conjugations.

The infinitive form of a verb is identified by adding the word "to" next to the verb. For this reason, we can determine that the expression "to go on a field trip" has the infinitive in "to go."

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