2а) 1. We / not pick berries. 2. Dad / catch a big fish. 3. I / not visit the new café. 4. Tim / feed the rabbits. 5. We / not clean the new café. 6. I / learn an English poem. 7. We / begin the game.

Используем Present Perfect: have/has + третья форма глагола. В отрицательных предложениях добавляем not.

1. We haven’t picked berries.
2. Dad has caught a big fish.
3. I haven’t visited the new café.
4. Tim has fed the rabbits.
5. We haven’t cleaned the new café.
6. I have learnt an English poem.
7. We have begun the game.