Final answer:
The infinitive stem of the verb 'decir' in the future and conditional tenses is 'dir-'. The future tense endings are: -é, -ás, -á, -emos, -éis, -án. The conditional tense endings are: -ía, -ías, -ía, -íamos, -íais, -ían.
Step-by-step explanation:
The infinitive stem of the verb 'decir' in the future and conditional tenses is 'dir-'.This is an example of an irregular verb in these tenses, as the stem changes from the base infinitive. In both tenses, you just need to add the appropriate endings to this stem:
- For the future tense, the endings are: -é, -ás, -á, -emos, -éis, -án
- For the conditional tense, the endings are: -ía, -ías, -ía, -íamos, -íais, -ían
So, for example, in the future tense: yo diré, tú dirás, él/ella dirá, nosotros/nosotras diremos, vosotros/vosotras diréis, ellos/ellas dirán.
And in the conditional tense: yo diría, tú dirías, él/ella diría, nosotros/nosotras diríamos, vosotros/vosotras diríais, ellos/ellas dirían.