Answer:
Aluminum storm windows with painted finishes are slightly more expensive than those with natural finish.
Explanation:
The only verb in the given sentence is are. This form is the third person plural present of the verb to be. Here, it is used as a linking verb - a verb that connects the subject of the sentence with an adjective, noun, or descriptive phrase. Here, it connects the subject aluminum storm windows with painted finishes to slightly more expensive than those with natural finish - a part of the predicate that describes it.
