1. They have talked/have been talking about it all morning.

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