How do you conjugate devenir in futur simple? is it deveniras?

Because the "de" is a prefix of "venir" it has all the irregularities of the verb "venir"

deviendrai, deviendras, deviendra, deviendrons, deviendrez, deviendront

Sra (aka Mme)

To conjugate the verb "devenir" in the futur simple (future tense), you need to follow the general pattern for regular -ir verbs. However, it is important to note that "devenir" is an irregular verb, so it does not entirely follow the regular pattern.

Here is the conjugation of "devenir" in the futur simple tense:

- Je deviendrai (I will become)
- Tu deviendras (You will become)
- Il/Elle deviendra (He/She will become)
- Nous deviendrons (We will become)
- Vous deviendrez (You will become)
- Ils/Elles deviendront (They will become)

So, the correct conjugation of "devenir" in the futur simple is "deviendrai" for the first person singular (Je), and "deviendras" for the second person singular (Tu).