Я вижу двух студентов и слышу их го

Я вижу двух студентов и слышу их голоса,но не понимаю, на каком языке они говорят

Результаты (английский) 1:

I see two students and hear their voices, but I do not understand, what language they speak

Результаты (английский) 2:

I see two students and hear their voices, but do not understand, they are the language they speak

Результаты (английский) 3:

i see two students and to hear their voices, but i don"t know what language do they speak