That is to say, beside Indo-European and Indo-Hittite, there must have existed an Indo-Slurvian.
( ( That ( is ( to ( ( say , ) ( beside ( ( Indo-European and ) Indo-Hittite ) ) ) ) ) ) ( , ( there ( ( must ( have ( existed ( an Indo-Slurvian ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (DT That)) (VP (VBZ is) (S (VP (TO to) (VP (VB say) (, ,) (PP (IN beside) (NP (NNP Indo-European) (CC and) (NNP Indo-Hittite)))))))) (, ,) (NP (EX there)) (VP (MD must) (VP (VB have) (VP (VBN existed) (NP (DT an) (NN Indo-Slurvian))))) (. .)))
There are many types of Indo people in existence.
( There ( ( are ( ( many types ) ( of ( ( Indo people ) ( in existence ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (JJ many) (NNS types)) (PP (IN of) (NP (NP (NNP Indo) (NNS people)) (PP (IN in) (NP (NN existence))))))) (. .)))