 |
| English | Russian |
| know for a fact | быть совершенно уверенным (Val_Ships) |
| know for a fact | быть абсолютно уверенным (to be certain,: I know for a fact that he did it. • I know for a fact that I have encountered the concept before. Val_Ships) |
| know for a fact | знать совершенно точно (I know for a fact that he can't speak a word of Japanese. Val_Ships) |