English verb conjugation
COULD WHIFFLE

Regular verb: whiffle - whiffled - whiffled

Affirmation

Simple form	V-ing form
I could whiffle you could whiffle he could whiffle we could whiffle you could whiffle they could whiffle	I could be whiffling you could be whiffling he could be whiffling we could be whiffling you could be whiffling they could be whiffling
Perfect	V-ing perfect
I could have whiffled you could have whiffled he could have whiffled we could have whiffled you could have whiffled they could have whiffled	I could have been whiffling you could have been whiffling he could have been whiffling we could have been whiffling you could have been whiffling they could have been whiffling

Negation

Simple form	V-ing form
I couldn't whiffle you couldn't whiffle he couldn't whiffle we couldn't whiffle you couldn't whiffle they couldn't whiffle	I couldn't be whiffling you couldn't be whiffling he couldn't be whiffling we couldn't be whiffling you couldn't be whiffling they couldn't be whiffling
Perfect	V-ing perfect
I couldn't have whiffled you couldn't have whiffled he couldn't have whiffled we couldn't have whiffled you couldn't have whiffled they couldn't have whiffled	I couldn't have been whiffling you couldn't have been whiffling he couldn't have been whiffling we couldn't have been whiffling you couldn't have been whiffling they couldn't have been whiffling

Interrogative form

Simple form	V-ing form
could I whiffle? could you whiffle? could he whiffle? could we whiffle? could you whiffle? could they whiffle?	could I be whiffling? could you be whiffling? could he be whiffling? could we be whiffling? could you be whiffling? could they be whiffling?
Perfect	V-ing perfect
could I have whiffled? could you have whiffled? could he have whiffled? could we have whiffled? could you have whiffled? could they have whiffled?	could I have been whiffling? could you have been whiffling? could he have been whiffling? could we have been whiffling? could you have been whiffling? could they have been whiffling?

Interro-negative form

Simple form	V-ing form
couldn't I whiffle? couldn't you whiffle? couldn't he whiffle? couldn't we whiffle? couldn't you whiffle? couldn't they whiffle?	couldn't I be whiffling? couldn't you be whiffling? couldn't he be whiffling? couldn't we be whiffling? couldn't you be whiffling? couldn't they be whiffling?
Perfect	V-ing perfect
couldn't I have whiffled? couldn't you have whiffled? couldn't he have whiffled? couldn't we have whiffled? couldn't you have whiffled? couldn't they have whiffled?	couldn't I have been whiffling? couldn't you have been whiffling? couldn't he have been whiffling? couldn't we have been whiffling? couldn't you have been whiffling? couldn't they have been whiffling?