The various subgroups of Indo-European include:
IndoIranianLanguages (e.g. SanskritLanguage?, HindiLanguage?, PersianLanguage?) ItalicLanguages? (including Latin and its descendants, the RomanceLanguages) GermanicLanguages (e.g. EnglishLanguage, GermanLanguage, DutchLanguage?, SwedishLanguage) CelticLanguages? (e.g. IrishLanguage?, WelshLanguage?) BalticLanguages? (e.g. OldPrussian?, LatvianLanguage?, LithuanianLanguage?) SlavicLanguages (e.g. OldSlavonic?, RussianLanguage?, PolishLanguage, CzechLanguage?, SerboCroatianLanguage?) IllyrianLanguages? (AlbanianLanguage? and extinct cousins) AnatolianLanguages? (extinct, most notable was the language of the HittitePeoples?) TocharianLanguages? (extinct tongues of TocharianPeoples?) GreekLanguage? ArmenianLanguage?
These are all InflectedLanguages? unlike, say, ChineseLanguages?. Some work indicates they may belong to a hypothetical language superfamily called the NostraticLanguages?. For those interested in such things, the original sounds appear to be
p t ky k kw Voiceless stops b d gy g gw Voiced stops bh dh ghy gh ghw Voiced aspirated stops
s z H1 H2 H3 Spirants, laryngeals (quality unknown) r l y w m n Semi-vowels, nasals
a e i o u Short vowels a^ e^ i^ o^? u^? Long vowels