English verb conjugation
COULD HAVOC

Regular verb: havoc - havoced - havoced

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?