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не знаю, смогу ли

I don't know if I can

→ не
phrase Rare #48,294
I don't know if I can Usually followed by an infinitive describing what the speaker may or may not be able to do.
RU: Не знаю, смогу ли помочь.
EN: I don't know if I can help.

Я не знаю, смогу ли прийти.

I don't know if I'll be able to come.

Не знаю, смогу ли, не знаю.

I don't know if I can. I don't know.

— Город бога (2002)

Я точно не знаю, смогу ли вечером прийти.

I'm not sure if I'll be able to come this evening.

Не знаю, смогу ли победить.

I don't know if I'll be able to win.

— Парень из гетто (2019)