English verb conjugation
COULD WHIFFLE

Regular verb: whiffle - whiffled - whiffled

Affirmation

Simple form	V-ing form
I could whiffle you could whiffle she could whiffle we could whiffle you could whiffle they could whiffle	I could be whiffling you could be whiffling she 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 she 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 she 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 could not whiffle you could not whiffle she could not whiffle we could not whiffle you could not whiffle they could not whiffle	I could not be whiffling you could not be whiffling she could not be whiffling we could not be whiffling you could not be whiffling they could not be whiffling
Perfect	V-ing perfect
I could not have whiffled you could not have whiffled she could not have whiffled we could not have whiffled you could not have whiffled they could not have whiffled	I could not have been whiffling you could not have been whiffling she could not have been whiffling we could not have been whiffling you could not have been whiffling they could not have been whiffling

Interrogative form

Simple form	V-ing form
could I whiffle? could you whiffle? could she whiffle? could we whiffle? could you whiffle? could they whiffle?	could I be whiffling? could you be whiffling? could she 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 she 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 she 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
could I not whiffle? could you not whiffle? could she not whiffle? could we not whiffle? could you not whiffle? could they not whiffle?	could I not be whiffling? could you not be whiffling? could she not be whiffling? could we not be whiffling? could you not be whiffling? could they not be whiffling?
Perfect	V-ing perfect
could I not have whiffled? could you not have whiffled? could she not have whiffled? could we not have whiffled? could you not have whiffled? could they not have whiffled?	could I not have been whiffling? could you not have been whiffling? could she not have been whiffling? could we not have been whiffling? could you not have been whiffling? could they not have been whiffling?