Have you fed the cats? – yes, i … . / yes, i … them before dinner.
has she ever eaten snails? – no, she … . / yes, she … them in italy last summer.
have they found the photos? – no, they … . / yes, they … them yesterday.
have you planted the tulips? – no, i … yet. / yes, i … them on friday.
has he already seen your garden? – yes, he … . / yes, he … it a month ago.​