Final answer:
The verb 'chases' should be changed to 'chased'.
Step-by-step explanation:
The verb in the sentence Dustin Henderson was chases me down the beach when we saw you is in the incorrect tense. The correct tense should be chased. The past tense of the verb 'chase' is 'chased'. Therefore, the sentence should be rewritten as Dustin Henderson chased me down the beach when we saw you.
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