1 Underline the correct form.

Решение:

• 1. They have been talking about it all morning.
• 2. He's not here because he has gone to work. He'll be back at 4 o'clock.
• 3. The children cleaned the playground yesterday.
• 4. She has been studying all day.
• 5. I have been working without a break since 8 o'clock.
• 6. I have been walking to the park last week.