To make a negative sentence in Russian is very easy. Everything you have to do is just adding the negative particle не before a verb. It works for all tenses (preset, past and future).
- Я не хочу идти в офис – I don’t want to go to the office
- Я не хотел идти в офис – I didn’t want to go to the office
- Я не буду работать тут – I will not work here