Second Conditional

¿ When to use second conditional?

Conditional use means that an action depends on another. Conditionals are used to discuss real or unreal. In general, conditional sentences have the word "if" (si).

Note that there is no conditional tense for English and in Spanish there. At the same time, use the auxiliary verbs "would" to form the conditional in English.
There are four types of conditional sentences and the use of one over another reflects the likelihood of action.

STRUCTURE:
IF         condition              result
            past simple            WOULD+base verb
IF         I won the lottery  I would buy a car

EXAMPLE:
If I won the lottery, I would travel around the world. 

If I were in Brazil, I would go to Rio de Janeiro.

If I were you, I would buy that car.

 If he were in my place, he wouldn't do this. 

If I had more money, I would buy a nice apartment.