English verb conjugation
COULD TRIFFLE

Regular verb: triffle - triffled - triffled

Affirmation

Simple form	V-ing form
I could triffle you could triffle he could triffle we could triffle you could triffle they could triffle	I could be triffling you could be triffling he could be triffling we could be triffling you could be triffling they could be triffling
Perfect	V-ing perfect
I could have triffled you could have triffled he could have triffled we could have triffled you could have triffled they could have triffled	I could have been triffling you could have been triffling he could have been triffling we could have been triffling you could have been triffling they could have been triffling

Negation

Simple form	V-ing form
I could not triffle you could not triffle he could not triffle we could not triffle you could not triffle they could not triffle	I could not be triffling you could not be triffling he could not be triffling we could not be triffling you could not be triffling they could not be triffling
Perfect	V-ing perfect
I could not have triffled you could not have triffled he could not have triffled we could not have triffled you could not have triffled they could not have triffled	I could not have been triffling you could not have been triffling he could not have been triffling we could not have been triffling you could not have been triffling they could not have been triffling

Interrogative form

Simple form	V-ing form
could I triffle? could you triffle? could he triffle? could we triffle? could you triffle? could they triffle?	could I be triffling? could you be triffling? could he be triffling? could we be triffling? could you be triffling? could they be triffling?
Perfect	V-ing perfect
could I have triffled? could you have triffled? could he have triffled? could we have triffled? could you have triffled? could they have triffled?	could I have been triffling? could you have been triffling? could he have been triffling? could we have been triffling? could you have been triffling? could they have been triffling?

Interro-negative form

Simple form	V-ing form
could I not triffle? could you not triffle? could he not triffle? could we not triffle? could you not triffle? could they not triffle?	could I not be triffling? could you not be triffling? could he not be triffling? could we not be triffling? could you not be triffling? could they not be triffling?
Perfect	V-ing perfect
could I not have triffled? could you not have triffled? could he not have triffled? could we not have triffled? could you not have triffled? could they not have triffled?	could I not have been triffling? could you not have been triffling? could he not have been triffling? could we not have been triffling? could you not have been triffling? could they not have been triffling?