could involute
Regular verb: involute - involuted- involuted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could involute
you could involute
she could involute
we could involute
you could involute
they could involute 	I could be involuting
you could be involuting
she could be involuting
we could be involuting
you could be involuting
they could be involuting	I could have involuted
you could have involuted
she could have involuted
we could have involuted
you could have involuted
they could have involuted	I could have been involuting
you could have been involuting
she could have been involuting
we could have been involuting
you could have been involuting
they could have been involuting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't involute
you couldn't involute
she couldn't involute
we couldn't involute
you couldn't involute
they couldn't involute 	I couldn't be involuting
you couldn't be involuting
she couldn't be involuting
we couldn't be involuting
you couldn't be involuting
they couldn't be involuting	I couldn't have involuted
you couldn't have involuted
she couldn't have involuted
we couldn't have involuted
you couldn't have involuted
they couldn't have involuted	I couldn't have been involuting
you couldn't have been involuting
she couldn't have been involuting
we couldn't have been involuting
you couldn't have been involuting
they couldn't have been involuting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I involute?
could you involute?
could she involute?
could we involute?
could you involute?
could they involute? 	could I be involuting?
could you be involuting?
could she be involuting?
could we be involuting?
could you be involuting?
could they be involuting? 	could I have involuted?
could you have involuted?
could she have involuted?
could we have involuted?
could you have involuted?
could they have involuted? 	could I have been involuting?
could you have been involuting?
could she have been involuting?
could we have been involuting?
could you have been involuting?
could they have been involuting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I involute?
couldn't you involute?
couldn't she involute?
couldn't we involute?
couldn't you involute?
couldn't they involute? 	couldn't I be involuting?
couldn't you be involuting?
couldn't she be involuting?
couldn't we be involuting?
couldn't you be involuting?
couldn't they be involuting? 	couldn't I have involuted?
couldn't you have involuted?
couldn't she have involuted?
couldn't we have involuted?
couldn't you have involuted?
couldn't they have involuted? 	couldn't I have been involuting?
couldn't you have been involuting?
couldn't she have been involuting?
couldn't we have been involuting?
couldn't you have been involuting?
couldn't they have been involuting?