Irregular Stems 特例

The only irregular conditional conjugations occur in about two dozen verbs which have irregular stems but use the same conditional endings listed above. Here are the French verbs with irregular conditional stems:

Verb

Conditional stem 

 Similarly-conjugated verbs
acheter achèter- achever, amener, emmener, lever, promener
appeler appeller- épeler, jeter, projeter, rappeler
aller ir-  
avoir aur-  
devoir devr-  
envoyer enverr-  
essayer essaier- employer, ennuyer, nettoyer, payer
être ser-  
faire fer-  
pleuvoir pleuvr-  
pouvoir pourr-  
savoir saur-  
venir viendr- revenir, devenir, parvenir
voir verr- revoir
vouloir voudr-  

*Notes:

  1. The exact same verbs are irregular in futur conjugations.
  2. The conditionnel stem always ends in R.