He belongs to a large family.
Kare no ie wa dai kazoku da.
he; him; his; boyfriend
indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question
house; residence; dwelling; family; household; lineage; family name
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
family; members of a family
be; is; indicates past or completed action; indicates light imperative