Zero conditional: Hoe: present simple - present simple
Wanneer: feit, wetenschappelijk bewezen, uitkomst staat vast
If you stand in the rain, you get wet. If you cut the tree, it falls down.
First conditional: Hoe: present simple - will/won't + hele ww
Wanneer: voorspelling, gaat waarschijnlijk gebeuren, logisch gevolg
If you marry him, you won't be happy. If we leave now, we will be in time
Second conditional: Hoe: past simple - would + hele ww
Wanneer: Hypothetisch, niet concreet, staat niet vast, "bedacht"
If she left him, he would make her life hell. If we won the lottery we would buy a big house