English verb conjugation
COULD FUME

Regular verb: fume - fumed - fumed

Affirmation

Simple form	V-ing form
I could fume you could fume he could fume we could fume you could fume they could fume	I could be fuming you could be fuming he could be fuming we could be fuming you could be fuming they could be fuming
Perfect	V-ing perfect
I could have fumed you could have fumed he could have fumed we could have fumed you could have fumed they could have fumed	I could have been fuming you could have been fuming he could have been fuming we could have been fuming you could have been fuming they could have been fuming

Negation

Simple form	V-ing form
I could not fume you could not fume he could not fume we could not fume you could not fume they could not fume	I could not be fuming you could not be fuming he could not be fuming we could not be fuming you could not be fuming they could not be fuming
Perfect	V-ing perfect
I could not have fumed you could not have fumed he could not have fumed we could not have fumed you could not have fumed they could not have fumed	I could not have been fuming you could not have been fuming he could not have been fuming we could not have been fuming you could not have been fuming they could not have been fuming

Interrogative form

Simple form	V-ing form
could I fume? could you fume? could he fume? could we fume? could you fume? could they fume?	could I be fuming? could you be fuming? could he be fuming? could we be fuming? could you be fuming? could they be fuming?
Perfect	V-ing perfect
could I have fumed? could you have fumed? could he have fumed? could we have fumed? could you have fumed? could they have fumed?	could I have been fuming? could you have been fuming? could he have been fuming? could we have been fuming? could you have been fuming? could they have been fuming?

Interro-negative form

Simple form	V-ing form
could I not fume? could you not fume? could he not fume? could we not fume? could you not fume? could they not fume?	could I not be fuming? could you not be fuming? could he not be fuming? could we not be fuming? could you not be fuming? could they not be fuming?
Perfect	V-ing perfect
could I not have fumed? could you not have fumed? could he not have fumed? could we not have fumed? could you not have fumed? could they not have fumed?	could I not have been fuming? could you not have been fuming? could he not have been fuming? could we not have been fuming? could you not have been fuming? could they not have been fuming?