9.3 French conditional: Conditionnell

9.3.1 Formation of the French conditional: conditionnel présent
The ending for the conditionnel I is always the same, only the stem of verbs differs (but only a bit). Verbs ending in -er und -ir just add this conditionnel-ending to the infinitive. Verbs ending in -oir or -re omit everything of their original ending and just use the r.

(to buy)
(to go out)
(to understand)
(to move)
  j'(e) achèterais I would buy sortirais I would go out entendrais I would understand mouvrais I would move -ais
  tu achèterais you would buy sortirais you would go out entendrais you would understand mouvrais you would move -ais
  il / elle achèterait he/she would buy sortirait he/she would go out entendrait he/she would understand mouvrait he/she would move -ait
  nous achèterions we would buy sortirions we would go out entendrions we would understand mouvrions we would move -ions
  vous achèteriez you would buy sortiriez you would go out entendriez you would understand mouvriez you would move - iez
  ils / elles achèteraient they would buy sortiraient they would go out entendraient they would understand mouvraient they would move - aient

Since there is no rule without exception, just have a short look at the the irregular verbs for conditionnel présent.

Irregular verbs    
  être = to be vouloir = to want savoir = to know faire = to do avoir = to have
  je serais je voudrais je saurais je ferais j' aurais
  tu serais tu voudrais tu saurais tu ferais tu aurais
  il / elle serait il / elle voudrait il / elle saurait il / elle ferait il / elle aurait
  nous serions nous voudrions nous saurions nous ferions nous aurions
  vous seriez vous voudriez vous sauriez vous feriez vous auriez
  ils / elles seraient ils / elles voudraient ils / elles sauraient ils / elles feraient ils / elles auraient

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