1. The first conditionalThe first conditional refers to present or future time and talks about real situations or events. We use the first conditional to talk about the present or future.Form - 'If' / 'Unless' + present simple, 'can' / 'will' / 'may':I'll stop if it turns red.2. The second conditionalThe second conditional also talks about the present or future but refers to imaginary or impossible situations and events.Form - 'If' / 'unless' + past , 'would' / 'could' / 'might':If I was rich, I'd have a car like that.In spoken English use 'were' or 'was' in the singular. When writing we use 'were':If I were rich, I'd be happier.The second conditional describes situations which are contrary to the facts:If I didn't have five children, I could afford a car. I wouldn't need to use the bus.