Learn Hardcore Esperanto: Mi legas artikolon pri komputiloj, ĉar mi volas aĉeti novan komputilon. - I read an article about computers, because I want to buy a new computer.

In Esperanto, the ending -n marks the accusative case, which is used for the direct object of a verb. In this sentence, artikolon is the direct object of legas (“read”), and komputilon is the direct object of aĉeti (“to buy”).

Why is "komputiloj" in its plural form without -n, while "komputilon" is singular and accusative?

The noun komputiloj follows the preposition pri (meaning “about”), and nouns after prepositions remain in the nominative case even if they are plural. This indicates the article is about computers in general. In contrast, komputilon is the direct object of the verb aĉeti, so it appears in the accusative singular form, referring to one new computer.

Why is the verb aĉeti in its infinitive form instead of being conjugated?

In Esperanto, when a verb follows another verb that expresses a desire or intention (like volas, “wants”), the following verb is used in the infinitive form. Here, volas aĉeti means “wants to buy,” where aĉeti remains uninflected as an infinitive.

What role does ĉar play, and how does it compare to "because" in English?

The word ĉar functions as a causal conjunction meaning “because.” It introduces the reason behind the action in the main clause. This usage is similar to “because” in English, connecting the fact that the speaker is reading the article with the reason that they want to buy a new computer.

Why does the adjective nova change to novan in this context?

In Esperanto, adjectives must agree with the case of the noun they modify. Since komputilon is in the accusative case, the adjective nova also takes the accusative ending, becoming novan. This agreement helps clarify that both words function together as the direct object of aĉeti.