♦ Here you are giving an example of what decision YOU would do given the circumstances. This can be in past tense or in a conditional present.

Examples:

1. If I were you, I would enjoy my vacation.
2. If I were you, I would explain what happened.
3. If I were you, I would continue working until it is done.
4. If I were you, I would book my reservations now.
5. If I were you, I would answer the question.

♦ By adding 'have' after the word 'would' you are talking about something in the past tense.

Examples:

1. If I were you, I would have enjoyed my vacation.
2. If I were you, I would have explained what happened.
3. If I were you, I would have continued working until it was done.
4. If I were you, I would have booked my reservations now.
5. If I were you, I would have answered the question.