Поставьте следующие предложения в настоящем совершенном непрерывном времени They (sleep) for three hours.
My sister (plant) flowers since four o’clock.
We (collect) rubbish at the park for two hours.
Our friends (recycle) cans for five hours.

They have been sleeping for three hours.
My sister has been planting flowers since four o’clock.
We have been collecting rubbish at the park for two hours.
Our friends have been recycling cans for five hours.