Okey-dokey, hirashin, I am sorry I sort of left you in the lurch here yesterday. I caught myself off-guard, as well. Frankly, with my medical condition being what it is I suppose it is sometimes the horrid medicines I have to take that cause me to get lost at times. Or I simply didn't think about my post properly before I started it.
By the way, I still have to give consideration to more specific tense related situations to be able to provide a proper answer, but there is something else that has come to mind.
Buntaro .made a reference to the language used in different nations and that is valid in some respects, but then I found many years ago that them folks in Boston seemed to be speaking English like the English spoke a hundred years before those years I had to spend in Boston, and over the river.
My point is that even within a nation itself there can be problems of a sort of language used. While Buntaro .is correct in giving thought to that in a teaching situation, such as this, there should also be the thought expressed not to get too hung up on that.
What would be a better point is what purpose you have, hirashin, in asking your question?
Just for everyday language? Or something more specific?
The reason why that could be important to ascertain is because if you have something other than simply day-to-day and person-to-person communications in mind, then possibly we will be heading down the path of formal language usage and that path is strewn with potholes. Just ask any professional script writer in Hollywood and they'll inform you that specifics can sink a writer, if they don't get it right.
Now, if you are simply asking for the purpose of day-to-day style communications, that is a very loose situation. And I am afraid I sense it has been getting looser since about 10 or so years back when this Internet really started to take off because it seems the average native speaker of English has started to lose touch with proper grammar and it also seems there is more and more leniency toward the use of non-standard English. "Non-standard" meaning bad grammar.
If that is the case --- day-to-day / person-to-person / not so strict --- then your two questions inasmuch as tense is concerned aren't a matter to be too concerned about. I already made note of the pronoun and proper noun, though.
So what I have now provided is an excellent post for you to study all sorts of weird language/vocabulary I have used and that gives me time to give other matters related to your question more thought.
I also suspect that we will now draw in some other folks that might have some thoughts about this idea of day-to-day communications not having to adhere to so very strict guidelines, IF your target is to simply be understood.
An illustration, if I may: I'd bet that when a group of English teachers leave their classrooms and go have a coffee break and speak amongst themselves you are going to hear some very not-so-strict language usage during that chit-chat. In fact, it is usually the individuals that use super-proper language that stick out and eventually are sort of worried about as to whether they are "normal".
In a loose day-to-day / person-to-person / small group situations the grammar can get loose, but you can still be easily understood, if you are not using a dialect the others can't understand. So when you ask usage questions we, that might want to try and help, might should ask the reason for the question(s).
If you are studying for a test, that's a whole different ballgame. And that use of "ballgame" could be an interesting discussion when we think of this nation or that nation and so on.
Oh, by the way, Buntaro, how comes you be leaving them Down Under folks out of your thinking? That fancy actor fella that caused all that trouble for them New York gangsters might be unhappy about that. I wonder if we could get him to join our community.
