The future active participle (-urus, -ura, -urum) with a form of sum means "be about to, be going to", and supplies a future tense in the subjunctive and the infinitive.
The participle ends in -urus and agrees with its subject: moriturus (from morior), victurus (vivo), futurus (sum), rediturus (redeo), habiturus (habeo), avolaturus (avolo).
With sum: avolaturum est "it is going to fly away"; futurum est, ut … "it is going to happen that …".
The subjunctive has no future tense, so -urus sim and -urus essem supply one in indirect questions and other clauses: quoque pacto habitura se sit "and how it will fare"; Etiamsi … victurus esses "even if you were going to live"; tanquam qui … moriturus sis "as one who is about to die".
The future infinitive is -urum esse, often shortened to -urum. After one est, a second participle may stand alone: nec deinceps rediturum "and it will not come back".