Final answer:
The word 'beyond' is the preposition in the sentence 'go beyond the bridge.' It indicates the relationship of direction or place between 'go' and 'the bridge.'
Step-by-step explanation:
In the sentence "go beyond the bridge," the word beyond is the preposition. A preposition is a word that shows the relationship between a noun or pronoun and other words in a sentence, typically indicating direction, place, time, or method. In this example, "beyond" connects the action of going to the location of the bridge, giving us the sense of where the action is directed.