Ancient Greek
Unlike Latin, Ancient Greek did not split into many languages, but it is still considered to be a separate language from Modern Greek. The pronunciation has changed; for instance, beta was pronounced "b" in Ancient Greek, but it is pronounced "v" and is called "vita" in Modern Greek. The spelling has not changed much, which gives the appearance of less change than has actually happened. Also, many different vowels and diphthongs merged into "i", the vowel sound in the English word "ski". The tonal system of Ancient Greek has disappeared, but Modern Greek had only recently changed its spelling to match that change.