Locate the complete gerund or infinitive phrase and identify its use.
Her motive was to keep peace in the family.
Verbal Phrase:
Use:
Infinitive phrases are very easy to find.
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http://www.chompchomp.com/terms/infinitive.htm
The verbal phrase in the sentence is "to keep peace in the family."
The use of this verbal phrase is an infinitive phrase. It functions as a noun in the sentence, serving as the direct object of the verb "was." It describes the motive or reason for the subject's actions.