Quando (when), enquanto (while) and assim que (as soon as) can be used in two completely different contexts. The subordinate clauses introduced by these conjunctions can describe an action / event that happened in the past. This case is easy. We use the indicative.
Quando, enquanto and assim que can as well introduce subordinate clauses that describes an action / event that will happen in the future and in this case we use the conjunctive and to be more precise, Portuguese is an exception here, the futuro do conjuntivo. It is useful to see, in order to avoid confusions, that the futuro do conjuntivo looks like the infinitivo pessoal in regular verbs. There is no difference in the form, but there is a very big difference in the syntactical function. The futuro do conjuntivo is a verbform and can be used in a subordinate clause introduced by a conjunction. The infinitivo pessoal is, like the infinitivo, a verbal noun, can therefore have the syntactical function of a noun and can therefore be used together with a preposition. The futuro do conjuntivo steems from the 3rd person plural, for instance falaram. If we leave out the personal ending -am, we get the stem falam and this looks like the infinitivo. Since the personal endings are the same and the steem is the same as well, there is no difference, in the case of the regular verbs, between the futuro do conjuntivo and the infinitivo pessoal.(Remark: The famous song "Dime cuando tú vendrás" is a serious infringement of the Spanish standard grammar. If the event / action of the subordinate clause introduced by cuando refers to the future, in Spanish as well the subjuntivo / subjunctive is compulsory. It should be: "Dime cuando tú vengas". That doesn't fit with them melody that requires that the pronunciation is on the second syllable, but would be grammatically correct.)
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