Breakdown of Мне всё равно, какой фильм мы посмотрим вечером.
Questions & Answers about Мне всё равно, какой фильм мы посмотрим вечером.
Because мне is the dative case of я.
The expression мне всё равно is a set phrase that literally works like to me, it is all the same. Russian often uses the dative case for the person who experiences a feeling, attitude, or state.
So:
- я = I
- мне = to me
In this sentence, мне всё равно means I don’t care or it makes no difference to me.
You will see the same pattern in other expressions too:
- мне холодно = I am cold
- мне интересно = I am interested
- мне нравится = I like it
So grammatically, Russian is not saying I don’t care the way English does. It is saying something more like to me, it is all the same.