The fragment "towe were so excited about uor vacation A trip to Europe" contains three errors:
Option 1 (Appositive — most natural):
"We were so excited about our vacation—a trip to Europe."
(Em dash sets off the clarifying phrase)
Option 2 (Colon — formal):
"We were so excited about our vacation: a trip to Europe."
Option 3 (Two sentences):
"We were so excited about our vacation. It was a trip to Europe."
The verb "were" is plural past tense of "to be." It requires a plural subject. "We" is the first-person plural pronoun. "They" would also work grammatically but changes meaning. The context ("our vacation") confirms first-person.
Lesson: Fragments often lack a subject. Find the verb, determine its number/person, and supply the matching pronoun or noun.