Complete the sentence with the correct form of the verb in brackets: "Nobody has ____ (find) a cheaper supplier since the contract was signed."

Erklärung

After "has" the verb takes its past participle, and this verb uses the same word for the past simple and the participle. The base form cannot follow an auxiliary in a perfect construction, and the regular spelling finded never appears, because the verb changes its vowel instead of adding -ed.