Hello there! I'd be happy to help you with this question.
The past participle of "cost" is "cost." In English, some irregular verbs have the same past simple tense (i.e. "cost") and past participle tense (i.e. "cost").
For example: - I cost $50. (present tense) - I spent $50 yesterday. (past simple tense) - I have spent $50 today. (present perfect tense with "have" + past participle, which is "spent" in this case) - I have cost my parents a lot of money this month. (present perfect tense with "have" + past participle, which is still "cost" in this case)
So, as you can see from these examples, regardless of whether you're talking in present, past, or present perfect tense, the past participle of "cost" always remains the same: "cost".
I hope that helps! Let me know if you have any further questions.
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