A little bit of grammar... (from a Macedonian Romani grammar)
"o" is the masculine definite article (equivalent of English the, and French le): o rat - the blood
"e" is the feminine definite article (French la): e jag - the fire
The article and ending both vary according to case. Romani has eight different cases: nominative, genitive, ablative, dative, accusative, vocative, instrumental and locative. To give you an idea of how it works, here's an example:
Roma
(singular)
1. nominative - o Rom
2. genitive - e Rom-eskoro
3. ablative - e Rom-estar
4. dative - e Rom-eskje
5. accusative - e Rom-e
6. vocative - Rom-a!
7. instrumental - e Rom-ea, esa
8. locative - e Rom-este
(plural)
1. nominative - e Roma
2. genitive - e Rom-engoro
3. ablative - e Rom-endar
4. dative - e Rom-engje
5. accusative - e Rom-en
6. vocative - Rom-alen!
7. instrumental - e Rom-enca
8. locative - Rom-ende