MIXED CONDITIONALS AND CONDITIONALS WITHOUT IF? IS THAT POSSIBLE?
Yes, it is. Sometimes conditional sentences do not follow the standard first, second and third conditional patterns but can include different verb forms. Sometimes you can even see conditional sentences "without"! if of another conditional word, such as "in case" or "unless".
For more information and practice:
read the following explanation,
do this exercise,
and then this one,
after that look at the explanation for conditional sentences without if.
Finally, read the information and do the exercise!