* AFIRMATIVA
subjet +vervo to + complement
sujeto + vervo  + complement
kevin is a good person
maria is very beautifol
juan and eva are friends

*NEGATIVAS
SUBJET + VERV + NOT COMPLEMENT
SUBJETO TO BE  + NOT + COMPLEMENT
kevin is not (isnt) a good person
maria  is not (isn t veri veautiful
juan and eva are  not  (caren t)friends.