Bonjour
1- If I were you, I would go round the world.
2- I would help you if it was possible.
3- I will see Leslie if have time.
4- If I had known their names, I would have introduced you.
5- You would have been disappointed if you had come.
6- I would leave school if I could.
If I were ► ce n'est pas une faute mais on ne dit jamais if I was ...
LA CONCORDANCE DES TEMPS
if + présent =================> futur (will + BV)
if + prétérit ==================>conditionnel présent ("would + BV)
if + pluperfect (past perfect)===> conditionnel passé ("would have +P.passé)
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bonne fin de soirée ☺☺☺