Accusative case has effect direct object
Latin
The accusative case in Latin has minor differences from the accusative case in Proto-Indo-European. 
Nouns in the accusative case (accusativus) can be used:as a direct object;
to qualify duration of time, e.g., multos annos, "for many years"; ducentos annos, "for 200 years"; this is known as the accusative of duration of time,
to qualify direction towards which e.g., domum, "homewards"; Romam, "to Rome" with no preposition needed; this is known as the accusative of place to which, and is equivalent to the lative case found in some other languages.
as the subject of an indirect statement with the verb in the subjunctive mood, (e.g. Dixit me fuisse saevum, "He said that I had been cruel"; in later Latin works, such as the Vulgate, such a phrasing is replaced by quod and a regularly ordered sentence, having the subject in the nominative and the verb in the indicative mood, e.g., Dixit quod ego fueram saevus).
with case-specific prepositions such as per (through), ad (to/toward), and trans (across);
in exclamations, such as me miseram, "wretched me" (spoken by Circe to Ulysses in Ovid's Remedium Amoris);
to qualify purpose, e.g., ad proficiscendum, "for the purpose of departing"; ad effēminandōs animōs, "for the purpose of weakening [or, effeminating] the spirit".For the accusative endings, see Latin declensions.For example, Hund (dog) is a masculine (der) word, so the article changes when used in the accusative case:Ich habe einen Hund. (lit., I have a dog.) In the sentence, "a dog" is in the accusative case as it is the second idea (the object) of the sentence.Some German pronouns also change in the accusative case.
The accusative case is also used after particular German prepositions. These include bis, durch, für, gegen, ohne, um, after which the accusative case is always used, and an, auf, hinter, in, neben, über, unter, vor, zwischen which can govern either the accusative or the dative. The latter prepositions take the accusative when motion or action is specified (being done into/onto the space), but take the dative when location is specified (being done in/on that space). These prepositions are also used in conjunction with certain verbs, in which case it is the verb in question which governs whether the accusative or dative should be used.
Adjective endings also change in the accusative case. Another factor that determines the endings of adjectives is whether the adjective is being used after a definite article (the), after an indefinite article (a/an) or without any article before the adjective (many green apples).
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