Conditional Overview with Examples

Present Real Conditional	Present Unreal Conditional
If I have time, I study English. Sometimes I have time.	If I had time, I would study English. I don't have time.
Past Real Conditional	Past Unreal Conditional
If I had time, I studied English. Sometimes I had time.	If I had had time, I would have studied English. I didn't have time.
Future Real Conditional	Future Unreal Conditional
If I have time, I will study English. If I have time, I am going to study English. I don't know if I will have time or not. Other forms possible.	If I had time, I would study English. I won't have time. Other forms possible.