How do I use and form the Accusative Case in singular?

The Accusative case is used the modify the noun that is the subject of the verb. For instance, in the sentence, 'I saw a book'. 'book' is the noun that will be modified. In the masculine and neuter case, the noun will only change in the accusative case if it is an animate; a living thing. Feminine nouns will always change in the accusative case, whether they are inanimate or animate.Masculine Nouns:1. If the noun in inanimate, there is no change.2. If noun is animate and ends in a consonant, add “а”.3. If noun is animate, replace “й”, with “я”.4. If noun is animate, replace “ь”, with “я”.Feminine Nouns:1. Replace “а” with “у”.2. Replace “я” with “ю”.3. Does not change if a soft sign.Neuter Nouns:1. Inanimate nouns do not change (almost all neuter nouns are inanimate)