If I did ..., I’d (= I would) ...
In the second conditional we use if + past (if I did, if I didn’t, etc.), but the meaning
is not past. In this type of structure, the past tense refers to an imaginary or hypothetical
situation, such as finding a lot of money in the street.
note: Instead of would, we can use could or might. After if we can use was or were after, except in the set phrase "If I were you..."
Examples:
• If I was in charge, I wouldn’t allow Bezos to sail his boat through the city.
• I know that if I won the lottery, I would buy a superyacht first of all.
• If I was him, I wouldn’t pay attention to their little protests.