could wag
Regular verb: wag - wagged- wagged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could wag
you could wag
he could wag
we could wag
you could wag
they could wag 	I could be wagging
you could be wagging
he could be wagging
we could be wagging
you could be wagging
they could be wagging	I could have wagged
you could have wagged
he could have wagged
we could have wagged
you could have wagged
they could have wagged	I could have been wagging
you could have been wagging
he could have been wagging
we could have been wagging
you could have been wagging
they could have been wagging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't wag
you couldn't wag
he couldn't wag
we couldn't wag
you couldn't wag
they couldn't wag 	I couldn't be wagging
you couldn't be wagging
he couldn't be wagging
we couldn't be wagging
you couldn't be wagging
they couldn't be wagging	I couldn't have wagged
you couldn't have wagged
he couldn't have wagged
we couldn't have wagged
you couldn't have wagged
they couldn't have wagged	I couldn't have been wagging
you couldn't have been wagging
he couldn't have been wagging
we couldn't have been wagging
you couldn't have been wagging
they couldn't have been wagging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I wag?
could you wag?
could he wag?
could we wag?
could you wag?
could they wag? 	could I be wagging?
could you be wagging?
could he be wagging?
could we be wagging?
could you be wagging?
could they be wagging? 	could I have wagged?
could you have wagged?
could he have wagged?
could we have wagged?
could you have wagged?
could they have wagged? 	could I have been wagging?
could you have been wagging?
could he have been wagging?
could we have been wagging?
could you have been wagging?
could they have been wagging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I wag?
couldn't you wag?
couldn't he wag?
couldn't we wag?
couldn't you wag?
couldn't they wag? 	couldn't I be wagging?
couldn't you be wagging?
couldn't he be wagging?
couldn't we be wagging?
couldn't you be wagging?
couldn't they be wagging? 	couldn't I have wagged?
couldn't you have wagged?
couldn't he have wagged?
couldn't we have wagged?
couldn't you have wagged?
couldn't they have wagged? 	couldn't I have been wagging?
couldn't you have been wagging?
couldn't he have been wagging?
couldn't we have been wagging?
couldn't you have been wagging?
couldn't they have been wagging?