Final answer:
The adjectival phrase in the sentence is 'with the locket', which describes the 'gold necklace'. It is essential to differentiate between adjectival phrases and other phrases like prepositional phrases in a sentence.
Step-by-step explanation:
The adjectival phrase in the sentence 'The gold necklace with the locket belonged to my grandmother who received it from her mother.' is 'with the locket'. An adjectival phrase is a group of words that describe or qualify a noun or pronoun in a sentence. The phrase 'with the locket' is providing more information about the 'gold necklace', which is the noun being described, making it an adjectival phrase.
Identifying parts of speech is essential for understanding how sentences are constructed. In this sentence, 'gold' is an adjective describing the noun 'necklace'. 'With' begins the adjectival phrase that modifies 'necklace'. The verbs in the sentence are 'belonged' and 'received'. Moreover, 'to my grandmother' and 'from her mother' are prepositional phrases which function differently and are not describing the necklace directly.