could boohoo
Regular verb: boohoo - boohooed- boohooed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could boohoo
you could boohoo
he could boohoo
we could boohoo
you could boohoo
they could boohoo 	I could be boohooing
you could be boohooing
he could be boohooing
we could be boohooing
you could be boohooing
they could be boohooing	I could have boohooed
you could have boohooed
he could have boohooed
we could have boohooed
you could have boohooed
they could have boohooed	I could have been boohooing
you could have been boohooing
he could have been boohooing
we could have been boohooing
you could have been boohooing
they could have been boohooing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't boohoo
you couldn't boohoo
he couldn't boohoo
we couldn't boohoo
you couldn't boohoo
they couldn't boohoo 	I couldn't be boohooing
you couldn't be boohooing
he couldn't be boohooing
we couldn't be boohooing
you couldn't be boohooing
they couldn't be boohooing	I couldn't have boohooed
you couldn't have boohooed
he couldn't have boohooed
we couldn't have boohooed
you couldn't have boohooed
they couldn't have boohooed	I couldn't have been boohooing
you couldn't have been boohooing
he couldn't have been boohooing
we couldn't have been boohooing
you couldn't have been boohooing
they couldn't have been boohooing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I boohoo?
could you boohoo?
could he boohoo?
could we boohoo?
could you boohoo?
could they boohoo? 	could I be boohooing?
could you be boohooing?
could he be boohooing?
could we be boohooing?
could you be boohooing?
could they be boohooing? 	could I have boohooed?
could you have boohooed?
could he have boohooed?
could we have boohooed?
could you have boohooed?
could they have boohooed? 	could I have been boohooing?
could you have been boohooing?
could he have been boohooing?
could we have been boohooing?
could you have been boohooing?
could they have been boohooing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I boohoo?
couldn't you boohoo?
couldn't he boohoo?
couldn't we boohoo?
couldn't you boohoo?
couldn't they boohoo? 	couldn't I be boohooing?
couldn't you be boohooing?
couldn't he be boohooing?
couldn't we be boohooing?
couldn't you be boohooing?
couldn't they be boohooing? 	couldn't I have boohooed?
couldn't you have boohooed?
couldn't he have boohooed?
couldn't we have boohooed?
couldn't you have boohooed?
couldn't they have boohooed? 	couldn't I have been boohooing?
couldn't you have been boohooing?
couldn't he have been boohooing?
couldn't we have been boohooing?
couldn't you have been boohooing?
couldn't they have been boohooing?