Not a teacher
i) The first one seems like it's happening at that exact moment, while the second one almost seems like an afterthought.
ii) The first one seems like it'd happen sooner than the second one. Same with the first couple's scenarios, one seems like resent tense the second is past tense.
They're all correct per say, it just depends on the tense you use them in. Hope I helped!
Student or Learner