I could photocoagulate you could photocoagulate she could photocoagulate we could photocoagulate you could photocoagulate they could photocoagulate
V-ing form
I could be photocoagulating you could be photocoagulating she could be photocoagulating we could be photocoagulating you could be photocoagulating they could be photocoagulating
Perfect
I could have photocoagulated you could have photocoagulated she could have photocoagulated we could have photocoagulated you could have photocoagulated they could have photocoagulated
V-ing perfect
I could have been photocoagulating you could have been photocoagulating she could have been photocoagulating we could have been photocoagulating you could have been photocoagulating they could have been photocoagulating
Negation
Simple form
I couldn't photocoagulate you couldn't photocoagulate she couldn't photocoagulate we couldn't photocoagulate you couldn't photocoagulate they couldn't photocoagulate
V-ing form
I couldn't be photocoagulating you couldn't be photocoagulating she couldn't be photocoagulating we couldn't be photocoagulating you couldn't be photocoagulating they couldn't be photocoagulating
Perfect
I couldn't have photocoagulated you couldn't have photocoagulated she couldn't have photocoagulated we couldn't have photocoagulated you couldn't have photocoagulated they couldn't have photocoagulated
V-ing perfect
I couldn't have been photocoagulating you couldn't have been photocoagulating she couldn't have been photocoagulating we couldn't have been photocoagulating you couldn't have been photocoagulating they couldn't have been photocoagulating
Interrogative form
Simple form
could I photocoagulate? could you photocoagulate? could she photocoagulate? could we photocoagulate? could you photocoagulate? could they photocoagulate?
V-ing form
could I be photocoagulating? could you be photocoagulating? could she be photocoagulating? could we be photocoagulating? could you be photocoagulating? could they be photocoagulating?
Perfect
could I have photocoagulated? could you have photocoagulated? could she have photocoagulated? could we have photocoagulated? could you have photocoagulated? could they have photocoagulated?
V-ing perfect
could I have been photocoagulating? could you have been photocoagulating? could she have been photocoagulating? could we have been photocoagulating? could you have been photocoagulating? could they have been photocoagulating?
Interro-negative form
Simple form
couldn't I photocoagulate? couldn't you photocoagulate? couldn't she photocoagulate? couldn't we photocoagulate? couldn't you photocoagulate? couldn't they photocoagulate?
V-ing form
couldn't I be photocoagulating? couldn't you be photocoagulating? couldn't she be photocoagulating? couldn't we be photocoagulating? couldn't you be photocoagulating? couldn't they be photocoagulating?
Perfect
couldn't I have photocoagulated? couldn't you have photocoagulated? couldn't she have photocoagulated? couldn't we have photocoagulated? couldn't you have photocoagulated? couldn't they have photocoagulated?
V-ing perfect
couldn't I have been photocoagulating? couldn't you have been photocoagulating? couldn't she have been photocoagulating? couldn't we have been photocoagulating? couldn't you have been photocoagulating? couldn't they have been photocoagulating?