List the main parts of d prepositional phrase

Geniuses is being modified.
Creative is the modifier
An adjective modifies a noun
An adverb modifies a verb.
Without would be the prepositional phrase (maybe more like conditional or qualifying phrase)
Geniuses is a noun.
Hope this helps.
Was an English major a long time ago.
Now I just try to remember.

A preposition . If you have no preposition you have no prepositional phrase.

"these" suggests a position to days. This would be a time preposition. (I think, but I haven't had a grammar class for 20+ years!....)

Look for the preposition. What follows it is the prepositional phrase.

Choose a prepositional phrase that makes sense to you. Supply a verb and a subject. Conjugate the verb to the tense you want. Enforce agreement between the verb and and its subject.

You are on the wrong site dude. This is a mechanical help site. If you have a problem with your car, not studying for tests DAH!!!

http://www.advanced-english-grammar.com/list-of-prepositional-phrases.html

The preposition is "across" and its object is "the hall."

The only possible preposition I see is NEXT. However it can be adjective, preposition, or adverb. Here NEXT WEEK is an adverbial phrase (of time). So I do not see any prepositional phrase.

I would say" At the top of the mountain, it was cold! This phrase will answer the question" Where was it cold? The key word is AT, which is your preposition.
Let me know if it helped!