Has is the perfect auxiliary verb of been. Sold is a past participle. A past participle is always needed in all passive tenses.
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Anonymoushas is the the auxiliary verb of sold which is a V3 of sell, then what is 'been"?No. 'has' is not an auxiliary of 'sold' — not directly, anyway. 'has' is an auxiliary of 'been'. 'been' is an auxiliary of 'sold'.
AnonymousThank you greatly. But I'm still confuse the word 'sold'. Is it a v3 of 'sell', or is it an adjective?In the present perfect passive, "sold" is the v3 of "sell."