a certain (a) (indefinite determiner) | una certa (a) (indefinite determiner) |
a certain (a) (indefinite determiner) | un (a) (indefinite determiner) |
a certain (a) (indefinite determiner) | una (a) (indefinite determiner) |
a certain (a) (indefinite determiner) | un certo (a) (indefinite determiner) |