String him along is a saying. It begins with the word string.
string
An organized string of words could be a phrase, a clause, or a sentence.
A 'phrase'.
I'll be back
ars gratia artis
Parliament
PICKLEEEEEESSSSSS I LOVE PICKLES
When the extra phrase begins with the word "and".
It could be:a be verb = am waiting, is kept.an auxiliary verb = have been waiting.a modal auxiliary verb = could have been waiting.
No. Into is a word. It is a preposition. A phrase is more than one word, so a prepositional phrase will have more than one word eg into the woods.
Whether it is one word or a phrase, the term is "anaphora".
A preposition is one word, a word that begins a prepositional phrase. A prepositional phrase contains more than one word.