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| Subject | English | Russian |
| inf. | hard to tell | трудно сказать (Val_Ships) |
| gen. | hard to tell | сложно сказать (Atenza) |
| cliche. | hard to tell from the picture | трудно сказать по фотографии (Hard to tell from the pictures, but does it look like smoke or a cloud? Fingers crossed it's a massive, fast developing cloud... (Reddit) ART Vancouver) |
| gen. | it is hard for me to tell | трудно мне судить |
| gen. | it is hard to tell | трудно сказать |
| math. | it is hard to tell whether | трудно сказать |
| Игорь Миг | it's actually kind of hard to tell how old he is | сложно сказать, сколько ему лет |
| Игорь Миг | it's actually kind of hard to tell how old he is | трудно определить его возраст |
| cliche. | it's hard to tell | трудно сказать (what ... – ..., какие ...) |
| gen. | it's hard to tell | трудно сказать |