Question

My father and I, along with my grandfather’s help.

Which element is necessary to complete the sentence?
predicate
phrase
subject
modifier

Answer 1

The correct answer for the question that is being presented above is this one: "predicate." The element that is necessary to complete the sentence is the predicate. The sentence "My father and I, along with my grandfather’s help" is kinda lacking and it's like a fragment.

Answer 2

The correct answer is predicate.
Without the predicate, the phrase above is just a phrase, a fragment of a sentence that could be incomplete. So, in order to complete it, in order to make it a full sentence instead of just a fragment, you need to add a verb, a predicate. For example: My father and I, along with my grandfather's help, managed to pain the house.
Managed to paint is the predicate which completes the fragment.