"Йому не треба бути там."

Translation: He does not need to be there.

[Holowcheezy]

I forget, why йому here instead of він?

[BarryLord1]

In English, we have He needs. But in Ukrainian, the expression is "It is necessary" (треба) to him or for him. To/for him is йому.

[Jaffarello]

Is "needn't" incorrect?

[bartfeenstra]

It's correct, although maybe British, which is why Duolingo does not recognize it yet.

[Kari884679]

I am from USA but I am familiar with that word... Maybe I read it in a book somewhere...