"Nevím, přežiju-li bez jejího úsměvu."

Translation: I don't know if I am going to survive without her smile.

[JanSvobi]

The Czech sentence doesn't seem natural at all. Wouldn't it make more sense for someone to say "Nevím, jestli přežiji/u bez jejího úsměvu"?

[VladaFu]

Sounds fine to me.

[AgnusOinas]

It's natural as a written sentence. The -li conjuction is not used in speech any more though, so when spoken, it would be "...jestli přežiju...". But it's totally OK like this in the written form.

[LukasBlech]

The sentence "I do not know if I survive without her smile" is not possible here? Or the "will" or "going to" is needed here to show the future? I am confused - not to use "will" after "if".

[AgnusOinas]

In English, the future tense is usually not used in conditional clauses after "if" (also "when", "unless"). Conditional clauses state a condition such as "We won't go out tomorrow if it's raining." Besides "jestli" or "-li", you can also use "pokud" or "když" in Czech in such sentences.

However, "if" is also used in non-conditional sentences, such as the one in this exercise. In these cases, you can replace the "if" with "whether", and you can replace the "jestli" (or "-li") with "zda" in Czech (but not "pokud" or "když"!). In such sentences, the future tense is used to refer to future events in both languages.

[LukasBlech]

Thank you for your great explanation! Get it.