English verb conjugation
COULD SPECIALIZE

Regular verb: specialize - specialized - specialized

Affirmation

Simple form	V-ing form
I could specialize you could specialize he could specialize we could specialize you could specialize they could specialize	I could be specializing you could be specializing he could be specializing we could be specializing you could be specializing they could be specializing
Perfect	V-ing perfect
I could have specialized you could have specialized he could have specialized we could have specialized you could have specialized they could have specialized	I could have been specializing you could have been specializing he could have been specializing we could have been specializing you could have been specializing they could have been specializing

Negation

Simple form	V-ing form
I could not specialize you could not specialize he could not specialize we could not specialize you could not specialize they could not specialize	I could not be specializing you could not be specializing he could not be specializing we could not be specializing you could not be specializing they could not be specializing
Perfect	V-ing perfect
I could not have specialized you could not have specialized he could not have specialized we could not have specialized you could not have specialized they could not have specialized	I could not have been specializing you could not have been specializing he could not have been specializing we could not have been specializing you could not have been specializing they could not have been specializing

Interrogative form

Simple form	V-ing form
could I specialize? could you specialize? could he specialize? could we specialize? could you specialize? could they specialize?	could I be specializing? could you be specializing? could he be specializing? could we be specializing? could you be specializing? could they be specializing?
Perfect	V-ing perfect
could I have specialized? could you have specialized? could he have specialized? could we have specialized? could you have specialized? could they have specialized?	could I have been specializing? could you have been specializing? could he have been specializing? could we have been specializing? could you have been specializing? could they have been specializing?

Interro-negative form

Simple form	V-ing form
could I not specialize? could you not specialize? could he not specialize? could we not specialize? could you not specialize? could they not specialize?	could I not be specializing? could you not be specializing? could he not be specializing? could we not be specializing? could you not be specializing? could they not be specializing?
Perfect	V-ing perfect
could I not have specialized? could you not have specialized? could he not have specialized? could we not have specialized? could you not have specialized? could they not have specialized?	could I not have been specializing? could you not have been specializing? could he not have been specializing? could we not have been specializing? could you not have been specializing? could they not have been specializing?