The second conditional is used to talk about unreal situations in the present or in the future. For example:
If I won the lottery, I would buy a new house.
In this example, the first part of the sentence, the if clause, is formed with a verb in the past form (won: past form of the verb to win). The second part, which is the consequence of the condition, is formed with would + verb in the infinitive form (would buy).
The sentence can be inverted: I would buy a new house if I won the lottery.
In formal speech, the verb to be in the if clause is always were: If she were rich, she would go to France.
What would you do QUIZ: This quiz brings many predicaments (difficult situations) and you have to choose an option. The site tells you whether that would be the best alternative and explains why.