could french-fry
Regular verb: french-fry - french-fried- french-fried

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could french-fry
you could french-fry
he could french-fry
we could french-fry
you could french-fry
they could french-fry 	I could be french-frying
you could be french-frying
he could be french-frying
we could be french-frying
you could be french-frying
they could be french-frying	I could have french-fried
you could have french-fried
he could have french-fried
we could have french-fried
you could have french-fried
they could have french-fried	I could have been french-frying
you could have been french-frying
he could have been french-frying
we could have been french-frying
you could have been french-frying
they could have been french-frying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't french-fry
you couldn't french-fry
he couldn't french-fry
we couldn't french-fry
you couldn't french-fry
they couldn't french-fry 	I couldn't be french-frying
you couldn't be french-frying
he couldn't be french-frying
we couldn't be french-frying
you couldn't be french-frying
they couldn't be french-frying	I couldn't have french-fried
you couldn't have french-fried
he couldn't have french-fried
we couldn't have french-fried
you couldn't have french-fried
they couldn't have french-fried	I couldn't have been french-frying
you couldn't have been french-frying
he couldn't have been french-frying
we couldn't have been french-frying
you couldn't have been french-frying
they couldn't have been french-frying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I french-fry?
could you french-fry?
could he french-fry?
could we french-fry?
could you french-fry?
could they french-fry? 	could I be french-frying?
could you be french-frying?
could he be french-frying?
could we be french-frying?
could you be french-frying?
could they be french-frying? 	could I have french-fried?
could you have french-fried?
could he have french-fried?
could we have french-fried?
could you have french-fried?
could they have french-fried? 	could I have been french-frying?
could you have been french-frying?
could he have been french-frying?
could we have been french-frying?
could you have been french-frying?
could they have been french-frying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I french-fry?
couldn't you french-fry?
couldn't he french-fry?
couldn't we french-fry?
couldn't you french-fry?
couldn't they french-fry? 	couldn't I be french-frying?
couldn't you be french-frying?
couldn't he be french-frying?
couldn't we be french-frying?
couldn't you be french-frying?
couldn't they be french-frying? 	couldn't I have french-fried?
couldn't you have french-fried?
couldn't he have french-fried?
couldn't we have french-fried?
couldn't you have french-fried?
couldn't they have french-fried? 	couldn't I have been french-frying?
couldn't you have been french-frying?
couldn't he have been french-frying?
couldn't we have been french-frying?
couldn't you have been french-frying?
couldn't they have been french-frying?