English verb conjugation
COULD NATURALIZE

Regular verb: naturalize - naturalized - naturalized

Affirmation

Simple form	V-ing form
I could naturalize you could naturalize he could naturalize we could naturalize you could naturalize they could naturalize	I could be naturalizing you could be naturalizing he 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 he 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 he 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 he 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 he 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 he 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 he 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 he naturalize? could we naturalize? could you naturalize? could they naturalize?	could I be naturalizing? could you be naturalizing? could he 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 he 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 he 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 he 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 he 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 he 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 he have been naturalizing? couldn't we have been naturalizing? couldn't you have been naturalizing? couldn't they have been naturalizing?