Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could quote quote you could quote quote he could quote quote we could quote quote you could quote quote they could quote quote
V-ing form
I could be quote quoting you could be quote quoting he could be quote quoting we could be quote quoting you could be quote quoting they could be quote quoting
Perfect
I could have quote quoted you could have quote quoted he could have quote quoted we could have quote quoted you could have quote quoted they could have quote quoted
V-ing perfect
I could have been quote quoting you could have been quote quoting he could have been quote quoting we could have been quote quoting you could have been quote quoting they could have been quote quoting
Negation
Simple form
I could not quote quote you could not quote quote he could not quote quote we could not quote quote you could not quote quote they could not quote quote
V-ing form
I could not be quote quoting you could not be quote quoting he could not be quote quoting we could not be quote quoting you could not be quote quoting they could not be quote quoting
Perfect
I could not have quote quoted you could not have quote quoted he could not have quote quoted we could not have quote quoted you could not have quote quoted they could not have quote quoted
V-ing perfect
I could not have been quote quoting you could not have been quote quoting he could not have been quote quoting we could not have been quote quoting you could not have been quote quoting they could not have been quote quoting
Interrogative form
Simple form
could I quote quote? could you quote quote? could he quote quote? could we quote quote? could you quote quote? could they quote quote?
V-ing form
could I be quote quoting? could you be quote quoting? could he be quote quoting? could we be quote quoting? could you be quote quoting? could they be quote quoting?
Perfect
could I have quote quoted? could you have quote quoted? could he have quote quoted? could we have quote quoted? could you have quote quoted? could they have quote quoted?
V-ing perfect
could I have been quote quoting? could you have been quote quoting? could he have been quote quoting? could we have been quote quoting? could you have been quote quoting? could they have been quote quoting?
Interro-negative form
Simple form
could I not quote quote? could you not quote quote? could he not quote quote? could we not quote quote? could you not quote quote? could they not quote quote?
V-ing form
could I not be quote quoting? could you not be quote quoting? could he not be quote quoting? could we not be quote quoting? could you not be quote quoting? could they not be quote quoting?
Perfect
could I not have quote quoted? could you not have quote quoted? could he not have quote quoted? could we not have quote quoted? could you not have quote quoted? could they not have quote quoted?
V-ing perfect
could I not have been quote quoting? could you not have been quote quoting? could he not have been quote quoting? could we not have been quote quoting? could you not have been quote quoting? could they not have been quote quoting?