Student or Learner
I wonder if tense of "is selling" is future or present progressive.
He is selling his car for $1,000.
In this case, I'd consider it present progressive, with the meaning "He is currently offering his car for sale."
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.