I could utilize you could utilize she could utilize we could utilize you could utilize they could utilize
V-ing form
I could be utilizing you could be utilizing she could be utilizing we could be utilizing you could be utilizing they could be utilizing
Perfect
I could have utilized you could have utilized she could have utilized we could have utilized you could have utilized they could have utilized
V-ing perfect
I could have been utilizing you could have been utilizing she could have been utilizing we could have been utilizing you could have been utilizing they could have been utilizing
Negation
Simple form
I could not utilize you could not utilize she could not utilize we could not utilize you could not utilize they could not utilize
V-ing form
I could not be utilizing you could not be utilizing she could not be utilizing we could not be utilizing you could not be utilizing they could not be utilizing
Perfect
I could not have utilized you could not have utilized she could not have utilized we could not have utilized you could not have utilized they could not have utilized
V-ing perfect
I could not have been utilizing you could not have been utilizing she could not have been utilizing we could not have been utilizing you could not have been utilizing they could not have been utilizing
Interrogative form
Simple form
could I utilize? could you utilize? could she utilize? could we utilize? could you utilize? could they utilize?
V-ing form
could I be utilizing? could you be utilizing? could she be utilizing? could we be utilizing? could you be utilizing? could they be utilizing?
Perfect
could I have utilized? could you have utilized? could she have utilized? could we have utilized? could you have utilized? could they have utilized?
V-ing perfect
could I have been utilizing? could you have been utilizing? could she have been utilizing? could we have been utilizing? could you have been utilizing? could they have been utilizing?
Interro-negative form
Simple form
could I not utilize? could you not utilize? could she not utilize? could we not utilize? could you not utilize? could they not utilize?
V-ing form
could I not be utilizing? could you not be utilizing? could she not be utilizing? could we not be utilizing? could you not be utilizing? could they not be utilizing?
Perfect
could I not have utilized? could you not have utilized? could she not have utilized? could we not have utilized? could you not have utilized? could they not have utilized?
V-ing perfect
could I not have been utilizing? could you not have been utilizing? could she not have been utilizing? could we not have been utilizing? could you not have been utilizing? could they not have been utilizing?