Desu ne is something you want to tell them that you felt right or after the question you ask (with someone Same age, really friendly with ỏ ưith the person is younger than you)
And Desu ka? Is the word like "right?" Is the Question too. Usually they use to the person you not really friend or the person older than you (formal)
The correct answer would be: Estés
Your mother expects you to be home by 8.
Tú madre espera que tú estés en class a las ocho.
Estés in the infinitive form is estar which has an -ar ending. Due to this you can change it to -es when you are using “tú”.
Tú means you. Due to this you must change the infinitive form (-ar) to -és. Which is why it is estés since they are talking about ‘you’ in the sentence.
Hope this helps! :3
It mean how has the topic "offense" affect your life as an individual.