Student or Learner
The sky is getting darker. It's almost rain.
The sky is getting darker. It's will rain soon.
Can we say "It's almost rain"?
No. They are both incorrect.
It will rain soon.
It's going to rain soon.
I think it will rain soon.
It might rain soon.
We can't say "It's almost raining" - it's either raining or it isn't raining.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.