Case is a special grammatical category of a noun, pronoun, adjective, participle or numeral whose value reflects the grammatical function performed by that word in a phrase, clause, or sentence. In some languages, nouns, pronouns, adjectives, determiners, participles, prepositions, numerals, articles and their modifiers take different inflected forms depending on what case they are in. As a language evolves, cases can merge (for instance, in Ancient Greek, the locative case merged with the dative), a phenomenon formally called syncretism. 

English has largely lost its case system, although personal pronouns still have three cases that are simplified forms of the nominative, accusative and genitive cases: subjective case (I, you, he, she, it, we, they, who, whoever), objective case (me, you, him, her, it, us, them, whom, whomever) and possessive case (my, mine; your, yours; his; her, hers; its; our, ours; their, theirs; whose; whosever). Forms such as "I", "he" and "we" are used for the subject ("I kicked the ball"), whereas forms such as "me", "him" and "us" are used for the object ("John kicked me"). 

Languages such as Sanskrit, Ancient Greek, Latin, Armenian, Hungarian, Tibetan, Czech, Slovak, Turkish, Tamil, Romanian, Russian, Polish, Serbo-Croatian, Estonian, Finnish, Icelandic, Ukrainian, Lithuanian, Basque, Esperanto and the majority of Caucasian languages have extensive case systems, with nouns, pronouns, adjectives, and determiners all inflecting (usually by means of different suffixes) to indicate their case. The number of cases differs between languages: German and Icelandic have four; Turkish, Latin and Russian each have at least six; Armenian, Czech, Polish, Serbian, Croatian, Ukrainian, and Lithuanian have seven; Sanskrit has eight; Estonian and Finnish have fifteen, Hungarian has eighteen and Tsez has sixty-four. QUESTIONS:

Q1:
1. How can case be defined?
2. What is meant by the term case?
3. 
Q2:
1. Does English use the case system?
2. Does there exist a case system in the English language?
3. 
Q3:
1. Is there a vast system of cases in Esperanto?
2. Does Esperanto make extensive use of the case system?
3. 
Q4:
1. Do all languages use the same number of cases?
2. Is case use consistent from language to language?
3. 
Q5:
1. What is the number of cases contained in the German and Icelandic languages?
2. How many cases can be found in German and Icelandic tongues?
3. 
Q6:
1. What is the number of cases contained in the Turkish, Latin and Russianc languages?
2. How many cases can be found in Turkish, Latin and Russian tongues?
3. 
Q7:
1. What is the number of cases contained in the Tzez language?
2. How many cases can be found in Tzez?
3. 
Q8:
1. What case are the words me, him and us affiliated with?
2. What is the purpose of linguistic forms like me, him and us?
3. 
Q9:
1. What purpose do the terms I, he, and we serve?
2. What case are words like I, he, and we grouped under?
3. 
Q10:
1. How many cases of personal pronouns does English continue to use?
2. What is the number of cases of personal pronouns that appear in modern day English?
3. 
