I could say:
- " If she comes I will cook something special"
I can imagine that if I want to emphasize that it is my plan to cook something nice I could use present continuous instead of future simple and say
- "If she comes I'm cooking something special"
Yet, 2 may be ambiguous it can also mean that I already started cooking before she came.
My big concern is what if I report my 2 example in indirect speech. Then, it becomes
- "If she came I was cooking something special"
So, in the past it has only one meaning that I started cooking before her arrival but it's weired that only by reporting one meaning is excluded or I'm mistaken somewhere?