The second conditional is used to talk about impossible or unlikely situations in the future. It uses "if" followed by the past tense verb in the if-clause, and "would" followed by the base verb in the main clause. For example, "If I won the lottery, I would travel around the world" or "If she had more time, she would travel more often." When using "I/he/she/it" in the if-clause, it is common to use "were" instead of "was," such as "If I were you, I would buy that car."