Irregular Conditionnel and Futur Stems in French

aller

ir-

avoir

aur-

être

ser-

faire

fer-

pouvoir

pourr-

vouloir

voudr-

venir

viendr-

devoir

devr-

savoir

saur-

voir

verr-

envoyer

enverr-

recevoir

recevr-

courir

courr-

mourir

mourr-

tenir

tiendr-

falloir

faudr- (only "il faudrait")

pleuvoir

pleuvr-

s'asseoir

s'assiér- (or s'assoir → s'assoir-)

valoir

vaudr- (il vaudrait mieux = it would be better) value/cost/something being worth the effort

acquérir

acquerr- (I would acquire)

cueillir

cueiller- (I would pick/gather)

s'apercevoir

s'apercevr- (I would realize)

décevoir

décevr- (I would disappoint)

apercevoir

apercevr- (I would notice)

prévoir

prévoir- (I would plan/foresee)

retenir

retiendr- (I would keep/retain)

obtenir

obtiendr- (I would obtain)

maintenir

maintiendr- (I would maintain)

lever

lèver- (I would lift — note the accent change)

acheter

achèter- (I would buy — adds accent)

appeler

appeller- (I would call — doubles the L)

jeter

jetter- (I would throw — doubles the T)