gray sky comparison to what
yes. the reflectioin of the sky will appear in the ocean
The gray sky enveloped his mood like a shroud.
The verb "is" in this sentence is a linking verb. It connects the subject "sky" with the adjective "gray" to describe the sky.
It can be either. The color gray is a noun. Used before a noun, it is an adjective (gray sky).
The sky
gray-ish
The sky looked very gloomy and gray today.
A gray sky either has a lot of clouds (and is likely to produce rain) or is very polluted (Los Angeles is often like that).
change and transformation
black and gray
because gray clouds roll in (they are gray because they are full of rain)
no the sky can be black ,gray ,blue and sometimes it can be red or orange