Prepositions show the relationship between a noun or pronoun and another word in the sentence. They often indicate location, direction, or time.
Here are some examples of "across" used as a preposition:
* The cat walked across the keyboard. (shows direction)
* We met across the street. (shows location)
* The meeting was scheduled across the weekend. (shows time)
To make "across" a verb, you would need to add a helping verb, like "go" or "walk". For example:
* We crossed the street.
* The cat crossed the keyboard.