English verb conjugation
COULD WRINKLE

Regular verb: wrinkle - wrinkled - wrinkled

Affirmation

Simple form	V-ing form
I could wrinkle you could wrinkle she could wrinkle we could wrinkle you could wrinkle they could wrinkle	I could be wrinkling you could be wrinkling she 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 she 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 she 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 could not wrinkle you could not wrinkle she could not wrinkle we could not wrinkle you could not wrinkle they could not wrinkle	I could not be wrinkling you could not be wrinkling she could not be wrinkling we could not be wrinkling you could not be wrinkling they could not be wrinkling
Perfect	V-ing perfect
I could not have wrinkled you could not have wrinkled she could not have wrinkled we could not have wrinkled you could not have wrinkled they could not have wrinkled	I could not have been wrinkling you could not have been wrinkling she could not have been wrinkling we could not have been wrinkling you could not have been wrinkling they could not have been wrinkling

Interrogative form

Simple form	V-ing form
could I wrinkle? could you wrinkle? could she wrinkle? could we wrinkle? could you wrinkle? could they wrinkle?	could I be wrinkling? could you be wrinkling? could she 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 she 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 she 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
could I not wrinkle? could you not wrinkle? could she not wrinkle? could we not wrinkle? could you not wrinkle? could they not wrinkle?	could I not be wrinkling? could you not be wrinkling? could she not be wrinkling? could we not be wrinkling? could you not be wrinkling? could they not be wrinkling?
Perfect	V-ing perfect
could I not have wrinkled? could you not have wrinkled? could she not have wrinkled? could we not have wrinkled? could you not have wrinkled? could they not have wrinkled?	could I not have been wrinkling? could you not have been wrinkling? could she not have been wrinkling? could we not have been wrinkling? could you not have been wrinkling? could they not have been wrinkling?