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".
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Question: My stomach tipped over.

Answer: Past


Question: Clinging to each other, they inched closer to the edge of the void.

Answer: Past


Question: Through the silence a persistent knocking vibrated.

Answer:
Past