Kohyoongliat, please note that there are four conditional sentences called Type Zero, Type One, Type Two and Type Three as exemplified and explained below:
If you heat the ice, it melts. (Type-0) - Natural (Certain)
If you eat well, you will grow healthy. (Type-I) - REAL (Probable)
If you ate well, you would grow healthy. (Type-2) - UNREAL (Hypothetical)
If you had eaten well, you would have grown healthy. (Type-3) - UNREALIZED (Unfulfilled)