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".

Q: Exciting stuff like reconnaissance and combat occur outside our purview as surveyors.

A: Present
****
Q: Jeff stiffened, then shook his head vigorously.

A: Past
****
Q: Newton changes every day.

A:
Present
****