could hee-haw
Regular verb: hee-haw - hee-hawed- hee-hawed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could hee-haw
you could hee-haw
he could hee-haw
we could hee-haw
you could hee-haw
they could hee-haw 	I could be hee-hawing
you could be hee-hawing
he could be hee-hawing
we could be hee-hawing
you could be hee-hawing
they could be hee-hawing	I could have hee-hawed
you could have hee-hawed
he could have hee-hawed
we could have hee-hawed
you could have hee-hawed
they could have hee-hawed	I could have been hee-hawing
you could have been hee-hawing
he could have been hee-hawing
we could have been hee-hawing
you could have been hee-hawing
they could have been hee-hawing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't hee-haw
you couldn't hee-haw
he couldn't hee-haw
we couldn't hee-haw
you couldn't hee-haw
they couldn't hee-haw 	I couldn't be hee-hawing
you couldn't be hee-hawing
he couldn't be hee-hawing
we couldn't be hee-hawing
you couldn't be hee-hawing
they couldn't be hee-hawing	I couldn't have hee-hawed
you couldn't have hee-hawed
he couldn't have hee-hawed
we couldn't have hee-hawed
you couldn't have hee-hawed
they couldn't have hee-hawed	I couldn't have been hee-hawing
you couldn't have been hee-hawing
he couldn't have been hee-hawing
we couldn't have been hee-hawing
you couldn't have been hee-hawing
they couldn't have been hee-hawing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I hee-haw?
could you hee-haw?
could he hee-haw?
could we hee-haw?
could you hee-haw?
could they hee-haw? 	could I be hee-hawing?
could you be hee-hawing?
could he be hee-hawing?
could we be hee-hawing?
could you be hee-hawing?
could they be hee-hawing? 	could I have hee-hawed?
could you have hee-hawed?
could he have hee-hawed?
could we have hee-hawed?
could you have hee-hawed?
could they have hee-hawed? 	could I have been hee-hawing?
could you have been hee-hawing?
could he have been hee-hawing?
could we have been hee-hawing?
could you have been hee-hawing?
could they have been hee-hawing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I hee-haw?
couldn't you hee-haw?
couldn't he hee-haw?
couldn't we hee-haw?
couldn't you hee-haw?
couldn't they hee-haw? 	couldn't I be hee-hawing?
couldn't you be hee-hawing?
couldn't he be hee-hawing?
couldn't we be hee-hawing?
couldn't you be hee-hawing?
couldn't they be hee-hawing? 	couldn't I have hee-hawed?
couldn't you have hee-hawed?
couldn't he have hee-hawed?
couldn't we have hee-hawed?
couldn't you have hee-hawed?
couldn't they have hee-hawed? 	couldn't I have been hee-hawing?
couldn't you have been hee-hawing?
couldn't he have been hee-hawing?
couldn't we have been hee-hawing?
couldn't you have been hee-hawing?
couldn't they have been hee-hawing?