You use the perfect tense ... all the biscuits’ or anything else in the past that has happened, you need the perfect tense! To form the perfect tense, you need the correct person of the verb ...

Usted' can be shortened to 'Ud' and 'ustedes' can be shortened to 'Uds'. Irregular verbs in the present tense in Spanish Irregular verbs don’t follow the usual pattern in the present tense.