English verb conjugation
COULD THRUM

Regular verb: thrum - thrumed - thrumed

Affirmation

Simple form	V-ing form
I could thrum you could thrum he could thrum we could thrum you could thrum they could thrum	I could be thruming you could be thruming he could be thruming we could be thruming you could be thruming they could be thruming
Perfect	V-ing perfect
I could have thrumed you could have thrumed he could have thrumed we could have thrumed you could have thrumed they could have thrumed	I could have been thruming you could have been thruming he could have been thruming we could have been thruming you could have been thruming they could have been thruming

Negation

Simple form	V-ing form
I couldn't thrum you couldn't thrum he couldn't thrum we couldn't thrum you couldn't thrum they couldn't thrum	I couldn't be thruming you couldn't be thruming he couldn't be thruming we couldn't be thruming you couldn't be thruming they couldn't be thruming
Perfect	V-ing perfect
I couldn't have thrumed you couldn't have thrumed he couldn't have thrumed we couldn't have thrumed you couldn't have thrumed they couldn't have thrumed	I couldn't have been thruming you couldn't have been thruming he couldn't have been thruming we couldn't have been thruming you couldn't have been thruming they couldn't have been thruming

Interrogative form

Simple form	V-ing form
could I thrum? could you thrum? could he thrum? could we thrum? could you thrum? could they thrum?	could I be thruming? could you be thruming? could he be thruming? could we be thruming? could you be thruming? could they be thruming?
Perfect	V-ing perfect
could I have thrumed? could you have thrumed? could he have thrumed? could we have thrumed? could you have thrumed? could they have thrumed?	could I have been thruming? could you have been thruming? could he have been thruming? could we have been thruming? could you have been thruming? could they have been thruming?

Interro-negative form

Simple form	V-ing form
couldn't I thrum? couldn't you thrum? couldn't he thrum? couldn't we thrum? couldn't you thrum? couldn't they thrum?	couldn't I be thruming? couldn't you be thruming? couldn't he be thruming? couldn't we be thruming? couldn't you be thruming? couldn't they be thruming?
Perfect	V-ing perfect
couldn't I have thrumed? couldn't you have thrumed? couldn't he have thrumed? couldn't we have thrumed? couldn't you have thrumed? couldn't they have thrumed?	couldn't I have been thruming? couldn't you have been thruming? couldn't he have been thruming? couldn't we have been thruming? couldn't you have been thruming? couldn't they have been thruming?