Question

If it _______ tomorrow, we'll go to the zoo.

1. A.
   don't rain
2. B.
   doesn't rain
3. C.
   won't rain
4. D.
   rained

Answer 1

B
if引导条件状语从句，主句用一般将来时或表将来的情态动词+动词原形，从句要用一般现在时。