Conditionals graph
Type	Example
0- always true if...	If I go, my girlfriend goes.
1- Probable, Future	I will go if my girlfriend goes.
2- Improbable, Present, Choice	I would go if my girlfriend went with me .
2- Improbable, Present, Ability	I could go if I had more money.
3- Past Choice	I would have gone if my girlfriend had gone with me.
3- Past Ability	I could have gone if I had had the money.