Відповідь:

1. You have already borrowed my book for a week.

2. I have just bought a new smartphone, but I haven`t put music on it yet.

3. I`ve just seen a football match with my father.

4. I have already bought something to eat.

5. Are you still looking for your keys? If you haven`t found them yet? I think they are in your bag.

Пояснення:

В предложениях исправляем Past Simple на Present Continious где  присутствуют слова-маркеры Present Continious, которые указывают на это время (just, already и тд)

• 1)You have already borrowed my book for a week
• 2)I have just bought a new smartphone but haven't put music on it yet
• 3)I have just watch a football match with my dad
• 4)I have already bought something to eat
• 5)Are you still looking for the keys? If you haven't found them yet, they are in your bag.