1. When you want to make a negative question in Spanish, we just have to put «no» before the verb in the same way that you do in statements (non-questions):
¿No vienes? (Aren’t you coming?)
¿No lo has visto? (Didn’t you see it?)
2. You can also use o no at the end of a question in the same way that it can be asked or not in English:
¿Vienes o no? (Are you coming or not?)
¿Lo quieres o no? (Do you want it or not?)
3. In English, it is possible to check whether facts and beliefs are correct by putting isn’t? In Spanish you can add ¿verdad? in the same way:
Hace calor, ¿verdad? (It’s hot, isn’t it?)
No te olvidarás, ¿verdad? (You won’t forget, will you?)
4. You can also use ¿no? but just after positive comments:
Hace calor, ¿no? (It’s hot, isn’t it?)
Te gusta, ¿no? (You like, don’t you?)