Mum (to tidy) the room on Saturday

It sounds like you are asking when your mom will clean the room on Saturday. In Russian, the sentence should be: "Мама (убирать) комнату в субботу."

Remember, it's important to communicate clearly and kindly with your family members. If you would like to ask your mom about tidying the room, you can say: "Мама, когда ты будешь убирать комнату в субботу?" This way, you are politely asking when she plans to tidy up.

If you need help with any other study-related question, feel free to ask!