In this task you are given a sentence. You must judge whether the main verb of the sentence is in present or past tense. Label the instances as "Present" or "Past" based on your judgment. If there is no verb in the given text, answer "Present".

Example Input: Mr. Littleton refuses to back down.
Example Output: Present

Example Input: It provided a minimal existence, and in time we learned more and more about our benefactors.
Example Output: Past

Example Input: This produces a chromatin protein.
Example Output:
Present