I could coagulate you could coagulate she could coagulate we could coagulate you could coagulate they could coagulate
V-ing form
I could be coagulating you could be coagulating she could be coagulating we could be coagulating you could be coagulating they could be coagulating
Perfect
I could have coagulated you could have coagulated she could have coagulated we could have coagulated you could have coagulated they could have coagulated
V-ing perfect
I could have been coagulating you could have been coagulating she could have been coagulating we could have been coagulating you could have been coagulating they could have been coagulating
Negation
Simple form
I could not coagulate you could not coagulate she could not coagulate we could not coagulate you could not coagulate they could not coagulate
V-ing form
I could not be coagulating you could not be coagulating she could not be coagulating we could not be coagulating you could not be coagulating they could not be coagulating
Perfect
I could not have coagulated you could not have coagulated she could not have coagulated we could not have coagulated you could not have coagulated they could not have coagulated
V-ing perfect
I could not have been coagulating you could not have been coagulating she could not have been coagulating we could not have been coagulating you could not have been coagulating they could not have been coagulating
Interrogative form
Simple form
could I coagulate? could you coagulate? could she coagulate? could we coagulate? could you coagulate? could they coagulate?
V-ing form
could I be coagulating? could you be coagulating? could she be coagulating? could we be coagulating? could you be coagulating? could they be coagulating?
Perfect
could I have coagulated? could you have coagulated? could she have coagulated? could we have coagulated? could you have coagulated? could they have coagulated?
V-ing perfect
could I have been coagulating? could you have been coagulating? could she have been coagulating? could we have been coagulating? could you have been coagulating? could they have been coagulating?
Interro-negative form
Simple form
could I not coagulate? could you not coagulate? could she not coagulate? could we not coagulate? could you not coagulate? could they not coagulate?
V-ing form
could I not be coagulating? could you not be coagulating? could she not be coagulating? could we not be coagulating? could you not be coagulating? could they not be coagulating?
Perfect
could I not have coagulated? could you not have coagulated? could she not have coagulated? could we not have coagulated? could you not have coagulated? could they not have coagulated?
V-ing perfect
could I not have been coagulating? could you not have been coagulating? could she not have been coagulating? could we not have been coagulating? could you not have been coagulating? could they not have been coagulating?