Question

select the linking verb and the predicate noun or predicate adjective.
helens vacation to the grand canyon at the age of four remains her most vivid childhood memory.

Explanation:

A linking verb connects the subject to a word that describes or renames it. In the sentence "Helen's vacation to the Grand Canyon at the age of four remains her most vivid childhood memory", "remains" is the linking verb as it links the subject ("Helen's vacation...") to the predicate noun ("her most vivid childhood memory"). A predicate noun renames the subject, and here "her most vivid childhood memory" renames what Helen's vacation (the subject) is in terms of her childhood memories.

Answer:

Linking verb: remains; Predicate noun: her most vivid childhood memory