BIEN or BUENO (BUEN) Bien is an adverb, so it will be referred to the verb, the action, of the sentence. So, as an adverb, the word “bien” won’t appear close to a noun but close to a verb and it will answer the question “How…?”. Look at the examples: – No he dormido bien. – I didn’t sleep well. (¿How did you sleep?) – Desde que hago ejercicio estoy muy bien. – Since I do exercise I am very well. (How are you?) Bueno, on the other hand, is and adjective, so it will accord with the noun it goes with. – La película buena. – The good film. – El libro bueno. – The good book. When “bueno” is used before the noun it becomes “buen” but only in the masculine. – El libro bueno > El buen libro. So basically bien is translated by well and bueno by good. So far so good but… when to use “bien” or “bueno” with “ser” and “estar“? I think that’s the most complicated part to understand but here is my attempt to make you finally understand this. “Ser” express a quality and “estar” a temporary thing or the result of something. Having this in mind, look at these examples: – Yo estoy bien. – I am good, fine, ok. – Yo soy bueno. – I am a good person. But: – Yo estoy bueno. – I am good looking. So careful with this if you don’t want to sound cocky ???? Oh, and remember we never use “bien” with “ser” . So, “Esto es bien“ is wrong, you either say “Esto está bien“, which means that ‘this is right, correct or good’, or “Esto es bueno”, meaning ‘This is good, beneficial’ depending on what you actually want to express.

"bastante" con estas palabras se usa para agregar enfoque a los adjetivos. "bastante bien" se usa para expresar algo un poco mas que bien. por ejemplo, cuando te preguntan "¿como estas?" "bastante bien,gracias." quiere decir que no estas simplemente "bien" sino "suficientemente bien". "bastante bueno" se usa igualmente para expresar algo un poco mas que simplemente "bueno". "¿Que tal salio el arroz de Maria?" "¡Salio bastante bueno!" no nada más "bueno".

I think both are correct, depending on the situation, but "bien" is more common, like: - ¿Cómo te fue en el examen? (How did the exam go?) - Bastante bien! (pretty good!) In Argentina we use "bueno" to say that a food tastes good, or when a girl is pretty (only when you're talking to a friend!, because it's not so polite) - How's that steak? - Bastante bueno! - How is she? how does she look? - Está bastante buena, es alta y tiene ojos azules (She's so fine, she's tall and has blue eyes)

Creo que la mejor manera de entender la diferencia es con ejemplos, así que: ESTE LIBRO ESTA BASTANTE BIEN o ESTE LIBRO ES BASTANTE BUENO EL PACIENTE ESTA BASTANTE BIEN pero no ESTA BASTANTE BUENO MI PERRO ES BASTANTE BUENO pero no ESTA BASTANTE BIEN So, as you can see, it has to do with the verb to be and its translation into Spanish, SER or ESTAR. However, sometimes like above on the first example using ESTA BASTANTE BIEN and ES BASTANTE BUENO means the same. I hope it helps you just a little