Final answer:
The infinitive stem of "venir" in the future and conditional tenses is "viendr-".
Step-by-step explanation:
The infinitive stem of the verb "venir" in the future and conditional tenses is "viendr-".
In the future tense, you would add the respective endings to the infinitive stem to form the conjugated verb forms. For example: je viendr-ai, tu viendr-as, il/elle viendr-a, nous viendr-ons, vous viendr-ez, ils/elles viendr-ont.
In the conditional tense, you would also add the respective endings to the infinitive stem to form the conjugated verb forms. For example: je viendr-ais, tu viendr-ais, il/elle viendr-ait, nous viendr-ions, vous viendr-iez, ils/elles viendr-aient.
The infinitive stem of the verb venir in the future and conditional tenses is viendr-. When constructing these tenses in French, you begin with this stem and then add the appropriate endings.
For example, the future tense of venir is formed by adding the future tense endings to this stem (je viendrai, tu viendras, etc.), while the conditional is formed with conditional endings (je viendrais, tu viendrais, etc.).