If I had more time, (I, to teach) you how to play basketball.
I was teaching
I would teach
Il s'agit de la conséquence, donc il faut employer would + base verbale.
If (you, not, to stop) complaining, I'll have to go.
If you did stop complaining...
If you couldn't stop complaining...
If you don't stop complaining...
Il s'agit d'un avertissement de ce qui va se passer si tu n'arrêtes pas de faire quelque chose.
My mother will be angry if (we, to be) late.
we will be
we had be
You (not to fail) your exam if you had studied.
wouldn't have failed
Il s'agit de la conséquence et elle est négative, donc : would not have + participe passé (failed).
My father (to lose) his flat if he doesn't pay his rent.
You missed the plane. You would have caught it if (you, to be) on time.
you had been
Il s'agit de la condition, donc : had + participe passé (been)