|
I don't think the OP questioned the use of the subjunctive after 'para que'. It looks like he was asking about the last part of the sentence where both the indicative and the subjunctive forms of the verb were given.
There are three clauses in the OP's sentence:
-guarda este dinero en tu alcancía (main clause - the subject is tú)
-para que no compres algo (secondary clause - the subject is tú)
-que no necesitas/necesites (noun clause that modifies 'algo' - the subject is tú)
If there is no change in the subject between the main and secondary clauses there isn't a need to introduce the secondary clause (no conjunction 'que' is needed after the preposition 'para,' in other words). In that case, the negated infinitive 'no comprar' would be used.
The noun clause at the end is modifying 'algo'. It is (by way of the noun clause) being categorized as something that is not needed by the other person. Those are the words.
But whether the conjugated verb in that clause is rendered in the indicative or the subjunctive mood depends on how the speaker feels about the need.
Here is where a native speaker can clarify, because this is mushy territory.
When is an unneeded item represented in the indicative mood?
When is an unneeded item represented in the subjunctive mood?
|