What is thosaigh in the aimsir fhaistineach?

In the Aimsir Fhaistineach (Future Tense) in Irish, "thosaigh" (to begin) is typically conjugated as "tosóidh" for the third person singular. For example, "tosóidh sé" means "he will begin." The future tense indicates actions that will happen later, and it is formed by using the appropriate future tense endings on the verb stem.