Поставить глагол в будущее время they (go in the mountains) when she returns. we (lye on a sunny beach) at 2 o’clock in the afternoon. the delegation (discuss the eco problems) tomorrow evening.

They will go in the mountains when she returns.

We will be lying on a sunny beach at 2 o' clock in the afternoon.

The delegation will discuss the Eco problems tomorrow evening.

They will go
We will lying
The delegation will discuss