This virus is spreading rapidly.

The sky is very beautiful, isn't it?

Seeing the empty cup, he poured another cup of tea.

He can recite the poem by heart.

There is not a single cloud in the sky.

This winter scenery is really beautiful, isn't it?

The sky was filled with cirrus intortus clouds, creating a beautiful scenery.

The tangled clouds covered the sky, and it began to rain.

The cirrus intortus cloud was floating in the sky, creating a beautiful scenery.

The theory of quantum entanglement is one of the most complex parts of physics.