Breakdown of Я возьму зонтик на всякий случай.
Questions & Answers about Я возьму зонтик на всякий случай.
Возьму is the future of the perfective verb взять (to take in the sense of take once / pick up / take along). Perfective future expresses a single completed action: I’ll take (it) / I’ll pick it up.
Буду брать is the future of the imperfective verb брать and usually suggests an ongoing, repeated, or process-like meaning (e.g., I’ll be taking / I’ll take (regularly)), which doesn’t fit as well for a one-time decision like grabbing an umbrella before leaving.
You can usually omit Я: Возьму зонтик на всякий случай.
Russian often drops subject pronouns because the verb ending (-у in возьму) already indicates 1st person singular.
You keep Я when you want emphasis/contrast, e.g., Я возьму, а ты не бери. (I’ll take it, but you don’t.)