Your sentence
No+hay+nadie+en+casa.
Words in this sentence
haber
to have; forms the perfect aspect; to hold, to possess; to exist; there be; “there is”, “there are” (hay); “there was”, “there were” (hubo/había); to have to; to be necessary; used to denote a past obligation
Verb
en
in, at, on; in (a time); in (a language); used after some verbs and translated by various prepositions in English; in (in various expressions)
Preposition