голоса их были слышны, но нельзя бы

голоса их были слышны, но нельзя было разобрать, о чем они говорят

Результаты (английский) 1:

their voices were heard, but it was impossible to make out what they are talking about

Результаты (английский) 2:

their voices were heard, but could not make out what they were saying

Результаты (английский) 3:

their voices have been heard, but couldn"t make out what they say