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