English verb conjugation
COULD NATURALIZE

Regular verb: naturalize - naturalized - naturalized

Affirmation

Simple form	V-ing form
I could naturalize you could naturalize she could naturalize we could naturalize you could naturalize they could naturalize	I could be naturalizing you could be naturalizing she could be naturalizing we could be naturalizing you could be naturalizing they could be naturalizing
Perfect	V-ing perfect
I could have naturalized you could have naturalized she could have naturalized we could have naturalized you could have naturalized they could have naturalized	I could have been naturalizing you could have been naturalizing she could have been naturalizing we could have been naturalizing you could have been naturalizing they could have been naturalizing

Negation

Simple form	V-ing form
I couldn't naturalize you couldn't naturalize she couldn't naturalize we couldn't naturalize you couldn't naturalize they couldn't naturalize	I couldn't be naturalizing you couldn't be naturalizing she couldn't be naturalizing we couldn't be naturalizing you couldn't be naturalizing they couldn't be naturalizing
Perfect	V-ing perfect
I couldn't have naturalized you couldn't have naturalized she couldn't have naturalized we couldn't have naturalized you couldn't have naturalized they couldn't have naturalized	I couldn't have been naturalizing you couldn't have been naturalizing she couldn't have been naturalizing we couldn't have been naturalizing you couldn't have been naturalizing they couldn't have been naturalizing

Interrogative form

Simple form	V-ing form
could I naturalize? could you naturalize? could she naturalize? could we naturalize? could you naturalize? could they naturalize?	could I be naturalizing? could you be naturalizing? could she be naturalizing? could we be naturalizing? could you be naturalizing? could they be naturalizing?
Perfect	V-ing perfect
could I have naturalized? could you have naturalized? could she have naturalized? could we have naturalized? could you have naturalized? could they have naturalized?	could I have been naturalizing? could you have been naturalizing? could she have been naturalizing? could we have been naturalizing? could you have been naturalizing? could they have been naturalizing?

Interro-negative form

Simple form	V-ing form
couldn't I naturalize? couldn't you naturalize? couldn't she naturalize? couldn't we naturalize? couldn't you naturalize? couldn't they naturalize?	couldn't I be naturalizing? couldn't you be naturalizing? couldn't she be naturalizing? couldn't we be naturalizing? couldn't you be naturalizing? couldn't they be naturalizing?
Perfect	V-ing perfect
couldn't I have naturalized? couldn't you have naturalized? couldn't she have naturalized? couldn't we have naturalized? couldn't you have naturalized? couldn't they have naturalized?	couldn't I have been naturalizing? couldn't you have been naturalizing? couldn't she have been naturalizing? couldn't we have been naturalizing? couldn't you have been naturalizing? couldn't they have been naturalizing?