"Si" clauses without subjunctive

[Amy]

Ok, English sentence:
"You will never be able to see my friends if you do not run as quickly as possible."
My translation: Numquam meas amicas videre poteris si quam celerrime non cucurreris.
Is using future perfect right there? is there any time when it's ok NOT to use future perfect? Thanks

[benissimus]

Ok, English sentence:
"You will never be able to see my friends if you do not run as quickly as possible."
My translation: Numquam meas amicas videre poteris si quam celerrime non cucurreris.
Is using future perfect right there? is there any time when it's ok NOT to use future perfect? Thanks

That works, but you could have curres rather than cucurreris. The way you write it puts emphasis on the fact that one thing must be done before the other.

The si and non should probably be removed in favor of nisi.

[Amy]

Thank you~ glad to see there's freedom with that; my teacher seems to have the idea "ONLY future perfect NEVER anything else". About nisi, yes looking at the vocab Jenney had the same idea.