Some languages have an explicit copula. Some have some extent of zero-copulas. Some languages permit putting TAM-markers and person congruence on the complement, i.e.
car new-3sg.neuter → (the) car is new
man town-loc-3sg.pres → the man is in town
However, an approach I've not seen much of - except maybe borderlinely so in English - is marking the subject for TAM and person, and have the complement unmarked for such things.
If this is attested (beyond clearly reduced copulas as in English), I'd be interested in knowing of it.