"Iuvenis Novi Eboraci habitat."

Translation: The young man lives in New York.

[bikejackel]

I put the young person lives in America because as I understand it "iuvenis" can refer to either sex. Duo disagreed and I reported it. Was I wrong?

[PERCE_NEIGE]

No, that was right. This word has the feminine and the masculine identical.
Be patient. It takes times.

[Ampus_Questor]

It takes /-/much/a lot of/a good deal of time (singular).

[A.H.52707]

Whats the difference of Eboraci and Eboracum?

[Rae.F]

Eboracum: nominative
Eboraci: locative*

* Where someone or something is located. Only used with the names of cities, towns, and small islands (proper nouns such as "Rome", not common nouns such as "city") plus the three common nouns "humus (ground)", "rus (countryside/farm)", and "domus (house/home)". These do not take any preposition. All other locations take a preposition and the ablative case.

[AaronD.2]

Iuvenis Noví Eborácí habitat.

[nkp2ro]

Difference between iuvenis and iuvenes?

[Rae.F]

Singular and plural.

[cherrylium]

What is the difference between iuvene and iuvenis?

[Rae.F]

Ablative vs nominative.

http://latindictionary.wikidot.com/noun:iuvenis

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Here is a plain-English overview of what the cases are and how they work:
Latin cases, in English

Here are the noun and adjective declension charts:
declensions 1-3
declensions 4&5

Adjectives must agree in gender, number, and case with the nouns they modify, but they have their own declensions. Sometimes you get lucky and the adjective just happens to follow the same declension as the noun, but that is not a guarantee.

For good measure, here are the verb conjugation charts:
1st Conjugation
2nd Conjugation
3rd Conjugation
3rd i-stem Conjugation
4th Conjugation