The genitive form of the Latin name Sergius Orata is the following: Sergii Oratae. In the case of the first name, 'Serg-' is the stem and -'us' is the nominative ending. So remove the '-us' ending, and add the genitive ending '-i'. In the case of the last name, 'Orat-' is the stem, and '-a' is the nominative ending. So remove the '-a' ending, and add the genitive ending '-ae'.
In Latin, the ending for the genitive plural of the 1st declension noun is -arum: femina, feminarum.
In Latin grammar, the "of" is included in a case called the genitive. For instance, if you wanted to say something like "mother of the girl", you would say "mater puellae", because -ae is the genitive of the word 'puella', meaning girl. With the -ae, it means "of the girl." Thus, the word 'of' is included because of that genitive ending. However, not all Latin words have the same genitive endings. Those are determined based on their declensions.
The Latin masculine noun collis (a hill) has a singular genitive collis and a plural genitive collium.
The Latin masculine noun tumulus (a rounded hill, a burial mound or grave) has the genitive singular tumuli and genitive plural tumulorum.
Is (genitive: eius).
Omnia is correct; omnis is either a nominative or a genitive singular noun ending.
There sort of isn't one. Latin uses the genitive case for all nouns that are preceded by the word "of" in English, rather than using a separate word.For instance: if you wanted to say "of the girl," you would simply take the Latin word for girl (puella) and add the genitive ending on to the stem, thus making the word puellae, which means "of the girl" in Latin.
"Growing" in Latin is crescens (genitive crescentis).
Draco (genitive: draconis).
Saltans (genitive: saltantis).
Corpus (genitive: corporis).