Questions & Answers about Kad budem u uredu, poslat ću vam e-mail.
Are kad and kada the same?
Yes. Both mean “when.” Kad is the shorter, very common form; kada can sound a bit more formal or is used for euphony. There’s no difference in meaning.
Why is budem used here instead of sam or ću biti?
In time clauses referring to a specific future moment (introduced by words like kad/čim/prije nego), standard Croatian uses so‑called Future II: present forms of biti (budem, budeš, bude…) + a complement. With the verb biti itself, you normally just say budem + complement (no need for bio): Kad budem u uredu…. You don’t use Future I (ću biti) after kad in this meaning.
Can I say Kad ću biti u uredu, poslat ću vam e-mail?
Not for “When I’m in the office, I’ll…”. After kad in this sense, don’t use ću biti. The sentence Kad ću biti u uredu? is fine as an independent question meaning “When will I be in the office?”, but it’s not how you form the time clause here.
Should it be Kad budem u uredu or Kad budem bio u uredu?