Answer:
Not sure what your asking but if you can comment a question I will do my best to help.
Answer:
The four words are:
"During the Chemistry experiment..."
Explanation:
The above words are the four words that make up the prepositional phrase.
A prepositional phrase is known to be a group of words which has a preposition with its object and other words that modify the object. Prepositional phrases can actually modify a noun or a verb.
Examples of common prepositions that actually begin prepositional phrases in sentences are: <em>to, about, during, behind, after, for, of, at, before, under, with, over, with, </em>and <em>by</em>.
The above sentences begin with a preposition and it is answering the question of when the smoke filled the class.
She successfully diffuses the tension by engaging Mr. Cunningham in conversation and is responsible that no violence occurs outside the jail that night.
