If I were you, I will help him.
If I were you, I WOULD help him.
If I see a monster, I would say "Hello!"
If I SAW a monster, I would say "Hello!"
If the weather will be fine, I will go for a walk.
If the weather IS fine, I will go for a walk.
If you mix black and white, you would get grey.
If you mix black and white, you GET grey.
If I am you, I would ask for help.
If I WERE you, I would ask for help.
If you heat ice, it melt.
If you heat ice, it MELTS.
Unless he doesn't apologize to me, I'll never speak to him again.
Unless he APOLOGIZES to me, I'll never speak to him again.
Unless I do my homework, I will get good marks.
Unless I do my homework, I WON'T get good marks.
If he will pass the exams, he will enter the university.
If he PASSES the exams, he will enter the university.
Unless I don't do my homework, I won't get good marks.
Unless I DO my homework, I won't get good marks.
If I visit London, I would stay at a hotel.
If I visitED London, I would stay at a hotel. OR If I visit London, I WILL stay at a hotel.
I would go outside if it isn't raining.
I WILL go outside if it isn't raining.