There are not very many verbs that are irregular in the conditional tense. The ones that are irregular will use a different stem, but the endings added on will still be the regular endings for the conditional tense. Notice that the irregular stems are the exact same ones used for the irregular verbs in the future tense.
Notice that in the first grouping, the stem is made by dropping the final vowel of the infinitive and replacing it with a “d”. In the second grouping, the final vowel is simply removed and not replaced with anything.
| VERB poner salir tener valer venir caber poder saber decir hacer querer | NEW STEM pondr- saldr- tendr- valdr- vendr- cabr- podr- sabr- dir- har- querr- | pondría, etc. saldría, etc. tendría, etc. valdría, etc. vendría, etc. cabría, etc. podría, etc. sabría, etc. diría, etc. haría, etc. querría, etc. |