The past participle of the verb "sink" is "sunk". It's one of those tricky irregular verbs that doesn't follow the usual rules. Normally, you'd just add -ed to the end of a verb to make it past tense and past participle. But "sink" isn't like that. It goes "sink" (present), "sank" (past), "sunk" (past participle). It's one to remember next time you're talking about something sinking. So in a sentence, you might say "The ship has sunk." How about you give it a try in a sentence yourself?
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