TASK DEFINITION: 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".
PROBLEM: But with HIV, any attempts to purify it and then photograph it using standard techniques have been total failures. "

SOLUTION: Present

PROBLEM: Says I told you to stop.

SOLUTION: Present

PROBLEM: " Back up, " Gabriel advised gruffly.

SOLUTION:
Past