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: The smile froze on Lisa's face.

SOLUTION: Past

PROBLEM: Now she was being chased.

SOLUTION: Past

PROBLEM: Raven launches herself over the wall, knocking Pippa out of the way just as the guard squeezes the trigger.

SOLUTION:
Present