Gökyüzü yavaş yavaş bulutlandı.
- The sky has gradually clouded over.
Gök bugün mavi, bulutsuz.
- The sky today is blue, without a cloud.
Bugün gökyüzünde bir sürü bulut var.
- There are lots of clouds in the sky today.
Bulutlar gökyüzünde rüzgarla sürüklendi.
- The clouds scudded across the sky.
He opened the door and was greeted by a cloud of bats.