1. Have you fed the cats? – Yes, I … . / Yes, I … them before dinner. 2. Has she ever eaten snails? – No, she … . / Yes, she … them in Italy last summer. 3. Have they found the photos? – No, they … . / Yes, they … them yesterday. 4. Have you planted the tulips? – No, I … yet. / Yes, I … them on Friday. 5. Has he already seen your garden? – Yes, he … . / Yes, he … it a month ago.

1. Have you fed the cats? – Yes, I have. / Yes, I fed them before dinner.
To answer this question, you can say "Yes, I have." This means that you have already done it. You can also provide more information by saying "Yes, I fed them before dinner." This explains when exactly you fed the cats.

2. Has she ever eaten snails? – No, she hasn't. / Yes, she has. She ate them in Italy last summer.
If the person has never eaten snails before, you can say "No, she hasn't." This means that she has never done it. On the other hand, if she has eaten snails before, you can say "Yes, she has." You can provide additional information by saying "She ate them in Italy last summer."

3. Have they found the photos? – No, they haven't. / Yes, they have. They found them yesterday.
If the people haven't found the photos yet, you can say "No, they haven't." This means that the photos have not been found. However, if they have already found the photos, you can say "Yes, they have." You can provide more information by saying "They found them yesterday."

4. Have you planted the tulips? – No, I haven't yet. / Yes, I have. I planted them on Friday.
If you haven't planted the tulips yet, you can say "No, I haven't yet." This means that the task has not been done. On the other hand, if you have already planted the tulips, you can say "Yes, I have." You can provide more information by saying "I planted them on Friday."

5. Has he already seen your garden? – Yes, he has. / Yes, he saw it a month ago.
If he has already seen your garden, you can say "Yes, he has." This means that he has already done it. You can also provide more information by saying "Yes, he saw it a month ago." This explains when exactly he saw your garden.