English verb conjugation
COULD WRINKLE

Regular verb: wrinkle - wrinkled - wrinkled

Affirmation

Simple form	V-ing form
I could wrinkle you could wrinkle he could wrinkle we could wrinkle you could wrinkle they could wrinkle	I could be wrinkling you could be wrinkling he could be wrinkling we could be wrinkling you could be wrinkling they could be wrinkling
Perfect	V-ing perfect
I could have wrinkled you could have wrinkled he could have wrinkled we could have wrinkled you could have wrinkled they could have wrinkled	I could have been wrinkling you could have been wrinkling he could have been wrinkling we could have been wrinkling you could have been wrinkling they could have been wrinkling

Negation

Simple form	V-ing form
I couldn't wrinkle you couldn't wrinkle he couldn't wrinkle we couldn't wrinkle you couldn't wrinkle they couldn't wrinkle	I couldn't be wrinkling you couldn't be wrinkling he couldn't be wrinkling we couldn't be wrinkling you couldn't be wrinkling they couldn't be wrinkling
Perfect	V-ing perfect
I couldn't have wrinkled you couldn't have wrinkled he couldn't have wrinkled we couldn't have wrinkled you couldn't have wrinkled they couldn't have wrinkled	I couldn't have been wrinkling you couldn't have been wrinkling he couldn't have been wrinkling we couldn't have been wrinkling you couldn't have been wrinkling they couldn't have been wrinkling

Interrogative form

Simple form	V-ing form
could I wrinkle? could you wrinkle? could he wrinkle? could we wrinkle? could you wrinkle? could they wrinkle?	could I be wrinkling? could you be wrinkling? could he be wrinkling? could we be wrinkling? could you be wrinkling? could they be wrinkling?
Perfect	V-ing perfect
could I have wrinkled? could you have wrinkled? could he have wrinkled? could we have wrinkled? could you have wrinkled? could they have wrinkled?	could I have been wrinkling? could you have been wrinkling? could he have been wrinkling? could we have been wrinkling? could you have been wrinkling? could they have been wrinkling?

Interro-negative form

Simple form	V-ing form
couldn't I wrinkle? couldn't you wrinkle? couldn't he wrinkle? couldn't we wrinkle? couldn't you wrinkle? couldn't they wrinkle?	couldn't I be wrinkling? couldn't you be wrinkling? couldn't he be wrinkling? couldn't we be wrinkling? couldn't you be wrinkling? couldn't they be wrinkling?
Perfect	V-ing perfect
couldn't I have wrinkled? couldn't you have wrinkled? couldn't he have wrinkled? couldn't we have wrinkled? couldn't you have wrinkled? couldn't they have wrinkled?	couldn't I have been wrinkling? couldn't you have been wrinkling? couldn't he have been wrinkling? couldn't we have been wrinkling? couldn't you have been wrinkling? couldn't they have been wrinkling?