In Spanish, to make a sentence negative simply put no before the verb:
No hago deporte.I don't exercise.
Fernanda no compra pan.Fernanda does not buy bread.
No duermes mucho.You don't sleep much.
If the sentence has me, te, se, le, nos, os, les then no goes in front of these:
No me levanto antes de las ocho.I don't get up before eight.
Tú no te lavas los dientes todos los días.You don't brush your teeth every day.
No se visten antes de las siete.They don't get dressed before seven.
Nosotros no nos duchamos por la mañana.We don't have a shower in the morning.
In Spanish, the adverb no is often repeated to emphasise the negation.
¿Vas al médico? – No, no voy al médico.Are you going to the doctor? - No, I am not going to the doctor.
See also Oración negativa and Forming negative sentences using no (negation) with complex verbal structures.
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