I wonder if DL would accept the more colloquial form, "I'll leave you alone."
It’s also accepted, but a closer Swedish phrase would be jag ska lämna er ensamma in that case.
Or jag ska lämna er i fred. Would you actually use jag ska lämna er ensamma? I'm fairly sure I wouldn't; it really sounds like an anglicism.
I'd use it, it doesn't sound like an anglicism to me unless you use it to mean 'leave alone' as in 'leave be' instead of literally 'leave alone'.
I have a doubt (at this moment i don't learn it), but what 'ska' is used for?, because i do an exercise and it's shows up and y don't know what is that word
I should probably leave this for an expert, but it is used to form the future tense. So it corresponds to "will" in English.
"Jag ska låta er vara i fred" would be the most natural form i Swedish, as "I will leave you alone" in English.
for me as a norwegian this sentence sounds like: "I am going to let you be lonely". because "ensam" or "ensom" means "lonely" in norwegian while it means "alone" in swedish, but I think it can be used as "lonely" in swedish as well.