El libro no es muy complicado.

Breakdown of El libro no es muy complicado.

ser
to be
no
no, not
el libro
the book
muy
very
complicado
complicated

Questions & Answers about El libro no es muy complicado.

Why do we use muy here instead of mucho?
We use muy (very) because it comes right before an adjective, which is a describing word like complicado. You use mucho (a lot / much) when you are talking about a noun or a verb, but to say 'very' before a description, it is always muy.
Does muy ever change its ending to match the noun?
No, muy never changes! Even if we were talking about multiple books (los libros) or a feminine word like a magazine (la revista), muy stays exactly the same.
Why does complicado end in an -o?
Because it is describing el libro, which is a masculine, singular word. If we were describing a feminine word, like a test (la prueba), it would change to complicada.
Why does no come before es?
In Spanish, the word no almost always goes directly in front of the verb it makes negative. Here, it goes right before es (is) to mean 'is not'.

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