Here are some examples:
* The police presented evidence of the suspect's guilt. (Evidence is the subject of the sentence.)
* They found new evidence in the case. (Evidence is the object of the verb "found".)
However, "evidence" can sometimes act as a verb, meaning "to provide evidence of something." For example:
* The witness evidenced the defendant's innocence.
It's less common to use "evidence" as a verb, but it's still a valid usage.