Mixed Conditionals

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.