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Is this sentence correct? Is it possible to use present subjunctive?
You won't learn English unless it (should) be important for you.
I have come across this one as well.
The native protein is glycosylated and runs with an apparent molecular mass of kDa on SDS-PAGE, but the sugar mass is not believed to contribute to the target size unless it should be important for transport activity which seems unlikely as the N-glycosylation has no impact on the transport activity of GLAST.
The cited example is a clumsy / antiquated form of "subjunctive", which in any case requires Past Tense / "hypothetical" wouldn't (=would not) rather than won't (=will not)...
...which would be better today phrased as [You wouldn't...] unless it were to be...
Or more informally, forget the subjunctive and just use unless it is / was. In the specific context, Present Tense (referencing a hypothetical "future") is more natural...
You won't learn English unless it is important
forto you.
