Нулевой я не знаю какой пример можно привести.
Первый:if it snows, they will go skiing
If i see Jane, i will invite her to my birthday party
Второй:if i knew the answer, i would tell you
If i were you, i would learn German
Третий:If the teenager had collected his thoughts, he would have won the competition
If i had been in Moscow at that time, i would have helped him
Zero Conditional:
1. If you mix blue and yellow, you get green.
2. If I spend a lot of time in front of the computer, my eyes hurt.
First Conditional:
1. I will buy this car if you give me some money.
2. If I don't pass the exam, I will be depressed.
Second Conditional:
1. If I were you, I would tell him everything about the accident.
2. If I had time, I would go to the theatre.
Third Conditional:
1. If you had told me that then, I would have believed you.
2. If I hadn't broken my arm, I would have gone skiing.
