Final answer:
The infinitive stem of "hacer" for both the future and conditional tenses in Spanish is "har"-, where the future or conditional endings are added to this stem.
Step-by-step explanation:
The infinitive stem of "hacer" in the future and conditional tenses in Spanish remains "har"-. When verbs are conjugated in the future or conditional tenses, the endings are added onto the infinitive stem. In the case of hacer, we add endings (such as -á, -ás, -á, -emos, -éis, -án for future tense, and -ía, -ías, -ía, -íamos, -íais, -ían for conditional tense) to this modified stem to form verbs like "haré" (I will do) or "haría" (I would do).
The infinitive stem of "hacer," crucial in constructing the future and conditional tenses, is "har-." In future scenarios, it transforms into "haré" (I will do/make) or "harías" (You would do/make) in hypothetical conditions. This linguistic alteration, a common thread in Spanish conjugation, unveils potential actions or outcomes.
Whether envisioning future endeavors or contemplating hypothetical situations, the versatile "har-" serves as a linguistic beacon, guiding verbs through the temporal landscape of Spanish expression. This linguistic nuance not only navigates the language but also facilitates a nuanced exploration of actions, possibilities, and conditions within the dynamic tapestry of communication.