could havoc
Regular verb: havoc - havoced- havoced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could havoc
you could havoc
he could havoc
we could havoc
you could havoc
they could havoc 	I could be havocing
you could be havocing
he could be havocing
we could be havocing
you could be havocing
they could be havocing	I could have havoced
you could have havoced
he could have havoced
we could have havoced
you could have havoced
they could have havoced	I could have been havocing
you could have been havocing
he could have been havocing
we could have been havocing
you could have been havocing
they could have been havocing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't havoc
you couldn't havoc
he couldn't havoc
we couldn't havoc
you couldn't havoc
they couldn't havoc 	I couldn't be havocing
you couldn't be havocing
he couldn't be havocing
we couldn't be havocing
you couldn't be havocing
they couldn't be havocing	I couldn't have havoced
you couldn't have havoced
he couldn't have havoced
we couldn't have havoced
you couldn't have havoced
they couldn't have havoced	I couldn't have been havocing
you couldn't have been havocing
he couldn't have been havocing
we couldn't have been havocing
you couldn't have been havocing
they couldn't have been havocing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I havoc?
could you havoc?
could he havoc?
could we havoc?
could you havoc?
could they havoc? 	could I be havocing?
could you be havocing?
could he be havocing?
could we be havocing?
could you be havocing?
could they be havocing? 	could I have havoced?
could you have havoced?
could he have havoced?
could we have havoced?
could you have havoced?
could they have havoced? 	could I have been havocing?
could you have been havocing?
could he have been havocing?
could we have been havocing?
could you have been havocing?
could they have been havocing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I havoc?
couldn't you havoc?
couldn't he havoc?
couldn't we havoc?
couldn't you havoc?
couldn't they havoc? 	couldn't I be havocing?
couldn't you be havocing?
couldn't he be havocing?
couldn't we be havocing?
couldn't you be havocing?
couldn't they be havocing? 	couldn't I have havoced?
couldn't you have havoced?
couldn't he have havoced?
couldn't we have havoced?
couldn't you have havoced?
couldn't they have havoced? 	couldn't I have been havocing?
couldn't you have been havocing?
couldn't he have been havocing?
couldn't we have been havocing?
couldn't you have been havocing?
couldn't they have been havocing?