The most common mix of two conditionals if the mix of the second and third conditional. There are two options:
Third Conditional (If-clause) + Second Conditional (main clause)
If some condition has been fulfilled (Third Conditional), the present situation would be different (Second Conditional):
- I had worked hard when I was young, I wouldn't be a poor old man now.
Second Conditional (If-clause) + Third Conditional (main clause)
Its most frequent use is with the phrase "If I were you", e.g.:
- If I were you, I would have helped her when she needed help.