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La caja es muy pesada.

La caja es muy pesada.
The box is very heavy.
From Lesson 50:Very vs. a lot (muy, mucho)·Spanish (Latin America)

Breakdown of La caja es muy pesada.

ser
to be
muy
very
la caja
the box
pesado
heavy

Questions & Answers about La caja es muy pesada.

Why do we use muy in this sentence instead of mucha?
We use muy (very) when we want to describe an adjective, like pesada (heavy). You would use a form of mucho (a lot of / many) if you were talking about a quantity of a noun, like having "many boxes" (muchas cajas).
If there were multiple boxes, would muy change to match them?
No, muy never changes! It doesn't have a gender or a plural form. If you had multiple boxes, the sentence would be Las cajas son muy pesadas. The noun and the adjective become plural, but muy stays exactly the same.
Why use es instead of está? Isn't a box only heavy until you take the stuff out of it?
It is a very common mix-up! In Spanish, physical characteristics like weight, size, shape, and color are treated as core traits of the object, so we use ser (here, es). We save estar for temporary conditions or states, like if the box is open (está abierta) or broken (está rota).
Why does the word for heavy end in an "-a" (pesada)?
Because it describes la caja (the box), which is a feminine noun. Adjectives in Spanish have to match the gender and number of the noun they describe. If we were talking about a masculine object, like a package (el paquete), it would be muy pesado.

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