Я не знаю еще, что такое инфинитивы, но правильно будет:
1. to smoke
2. stop
3. building
4. hear
If I where you, I would sell the car.
If I where you, I would have another car.
If I where you, I would buy a new one.
If I where you, I would repair it.
If I where you, I would ask somebody for help.
If I where you, I would take it to service station.
These men , women and children from Russia )))
I am answering your question.
Не очень корректный вопрос,и кстати,я на вопрос ответил!