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 couldn't triffle you couldn't triffle he couldn't triffle we couldn't triffle you couldn't triffle they couldn't triffle	I couldn't be triffling you couldn't be triffling he couldn't be triffling we couldn't be triffling you couldn't be triffling they couldn't be triffling
Perfect	V-ing perfect
I couldn't have triffled you couldn't have triffled he couldn't have triffled we couldn't have triffled you couldn't have triffled they couldn't have triffled	I couldn't have been triffling you couldn't have been triffling he couldn't have been triffling we couldn't have been triffling you couldn't have been triffling they couldn't 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
couldn't I triffle? couldn't you triffle? couldn't he triffle? couldn't we triffle? couldn't you triffle? couldn't they triffle?	couldn't I be triffling? couldn't you be triffling? couldn't he be triffling? couldn't we be triffling? couldn't you be triffling? couldn't they be triffling?
Perfect	V-ing perfect
couldn't I have triffled? couldn't you have triffled? couldn't he have triffled? couldn't we have triffled? couldn't you have triffled? couldn't they have triffled?	couldn't I have been triffling? couldn't you have been triffling? couldn't he have been triffling? couldn't we have been triffling? couldn't you have been triffling? couldn't they have been triffling?