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Cases

Nominative    from Latin nominare = to name (name-case: Who?)
Genitive from Latin genitus = born to/of (Whose [son....]?-case)
Dative from Latin dare = to give (I-give-to-case: to whom?)
Accusative from Latin accusare = to accuse ( I-accuse-him-case: Whom?)
Vocative from Latin vocare = to call (the "eh, you" or "listen,my friend!"-case)

Who? What? τίς;   τί;
  I, you, he (himself), it(self)   ἐγώ, σύ, αὐτός, αὐτό
  (Who is sleeping?)
  the lazy slave
  ὁ ῥάθυμος δοῦλος
  (What is named as being high?)
  the beautiful tree
  τὸ καλὸν δένδρον
Whose? τίνος;
  mine, yours, his, its...   μου, σου, αὐτοῦ
  (Whose work is hard?)
  The lazy slave's
  τοῦ ῥᾳθύμου δούλου
  Whose shade is very pleasant in summer?
  that of the beautiful tree
  τοῦ καλοῦ δένδρου
To whom? τίνι;
  to me, to you, to him, to it   μοι, σοι, αὐτῷ
  (To whom do you say: get working?)
  to the lazy slave
  τῷ ῥᾳθύμῳ δούλῳ
  (To what do you give water?)
  to the beautiful tree
  τῷ καλῷ δένδρῳ
Whom? What? τίνα;   τί;
  me, you, him, it   με, σε, αὐτόν, αὐτό
  (Whom do you see?)
  the lazy slave
  τὸν ῥᾴθυμον δοῦλον
  (What do you see over there?)
  the beautiful tree you've mentioned
  τὸ καλὸν δένδρον
Hi, my friend! χαῖρε, ὦ φίλε
  (Rouse that sleeping rascal)
  Don't sleep, you lazy slave!
  μὴ κάθευδε, ὦ δοῦλε ῥᾴθυμε  
  (Invoke the tree like it were a god)
  Oh beautiful tree!
  ὦ καλὸν δένδρον