Learn Hardcore Esperanto: Mia kapo estas peza.

Estas is the copula, meaning “is” in this context. In Esperanto, verbs do not conjugate for person or number. No matter what subject you have, estas remains unchanged, which simplifies the verb system quite a bit compared to English.

How does the possessive adjective mia work here, and why isn’t it marked differently?

Mia means “my” and acts as a possessive adjective modifying kapo (“head”). In Esperanto, possessive adjectives agree in number with the noun they modify. Since kapo is singular, mia remains in its singular form. If you were talking about multiple heads, you would use miaj kapoj.

Why does the adjective peza end with -a, and how do adjectives generally work in Esperanto?

In Esperanto, adjectives typically end in -a. The ending signals that the word is an adjective. When the adjective directly describes a singular noun, it stays in this basic form (as in peza for “heavy”). If the noun were plural, you would add the plural ending -j to the adjective, making it pezaj.

What is the sentence structure of “Mia kapo estas peza” compared to English?

The structure is quite similar to English: a subject (mia kapo), followed by a linking verb (estas), and then a predicate adjective (peza). This subject + verb + predicate adjective order is standard in Esperanto for describing states or qualities.

Could peza be placed in a different position, such as before the noun, and would that change the meaning?

Yes, adjectives in Esperanto can appear either attributively (before the noun) or predicatively (after the verb). For example, you could say mia peza kapo to mean “my heavy head.” While both forms are correct, placing the adjective after the verb (as in the given sentence) emphasizes that peza is describing the current state of the head.

Why doesn’t kapo have any case ending in this sentence?

In Esperanto, the nominative case (used for subjects) is unmarked. Since kapo is the subject of the sentence, it remains in its basic form. The accusative ending -n is only added to direct objects or to indicate direction. Since no object or directional meaning is needed here, no extra ending is used.