he didn't know
Он не знал наш язык, у него не было тут друзей.
He didn’t know our language, and he didn’t have any friends here.
— ПиКей (2014)
He didn't know what he wanted.
He didn’t know whom to trust.
Even he didn't know the truth.
Неужели он не знал, какая здесь обстановка?
Didn't he know what the situation was like here?
— Элитный отряд (2007)
Он позаботился о человеке, которого он не знал.
He took care of someone he didn’t know.
— Dersu Uzala (1975)
Мы постоянно были вместе потому, что он не знал никого.
We were always together because he didn’t know anyone.
— Сенна (2010)
He didn't know his parents.
Так как он не знал, что сказать, он промолчал.
Since he didn’t know what to say, he remained silent.