La respuesta rápida

Usa much con sustantivos incontables y many con sustantivos contables plurales, sobre todo en preguntas y negativas. Usa a lot of con ambos tipos en frases afirmativas. Se dice How much money? y How many friends?, no How much friends? ni How many money?

La regla

Much va con sustantivos incontables: How much time? Many va con sustantivos contables plurales: How many books? Ambos son más naturales en preguntas y frases negativas. En frases afirmativas, a lot of funciona con los dos tipos: She has a lot of friends. He has a lot of money.

A little y a few significan "algo, una cantidad pequeña pero suficiente": a little time, a few friends. Sin a, little y few significan "casi nada, insuficiente" — un significado mucho más negativo: little time (casi nada de tiempo), few friends (casi ningún amigo).

Forma

Ejemplos

• How many sisters do you have?
• How much money do you need?
• She has a lot of friends.
• I have a little money saved.
• We have few problems left.

Errores frecuentes

• ❌ How much books? → ✅ How many books? Many va con sustantivos contables plurales.
• ❌ How many money? → ✅ How much money? Much va con sustantivos incontables.
• ❌ He has much friends. → ✅ He has a lot of friends. A lot of es más natural que much/many en frases afirmativas.
• ❌ Don't worry, we have few time. → ✅ Don't worry, we have a little time. Sin a, few/little suenan negativos, lo cual contradice don't worry.