«ли» is an equivalent to «да или нет»
When can we leave out ли?
In what cases can we leave out "ли"? Я не знаю умер он или нет**or**Я не знаю умер ли он. Basically when should I use ли?
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2 Answers By Expert Tutors

Jim C. answered 04/03/19
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I'm an experienced, thoughtful tutor who speaks several languages. As
This is an easy one. You can't leave out ли in this or in any other sentence that includes an indirect question.
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