English verb conjugation
COULD CRINKLE

Regular verb: crinkle - crinkled - crinkled

Affirmation

Simple form	V-ing form
I could crinkle you could crinkle she could crinkle we could crinkle you could crinkle they could crinkle	I could be crinkling you could be crinkling she could be crinkling we could be crinkling you could be crinkling they could be crinkling
Perfect	V-ing perfect
I could have crinkled you could have crinkled she could have crinkled we could have crinkled you could have crinkled they could have crinkled	I could have been crinkling you could have been crinkling she could have been crinkling we could have been crinkling you could have been crinkling they could have been crinkling

Negation

Simple form	V-ing form
I couldn't crinkle you couldn't crinkle she couldn't crinkle we couldn't crinkle you couldn't crinkle they couldn't crinkle	I couldn't be crinkling you couldn't be crinkling she couldn't be crinkling we couldn't be crinkling you couldn't be crinkling they couldn't be crinkling
Perfect	V-ing perfect
I couldn't have crinkled you couldn't have crinkled she couldn't have crinkled we couldn't have crinkled you couldn't have crinkled they couldn't have crinkled	I couldn't have been crinkling you couldn't have been crinkling she couldn't have been crinkling we couldn't have been crinkling you couldn't have been crinkling they couldn't have been crinkling

Interrogative form

Simple form	V-ing form
could I crinkle? could you crinkle? could she crinkle? could we crinkle? could you crinkle? could they crinkle?	could I be crinkling? could you be crinkling? could she be crinkling? could we be crinkling? could you be crinkling? could they be crinkling?
Perfect	V-ing perfect
could I have crinkled? could you have crinkled? could she have crinkled? could we have crinkled? could you have crinkled? could they have crinkled?	could I have been crinkling? could you have been crinkling? could she have been crinkling? could we have been crinkling? could you have been crinkling? could they have been crinkling?

Interro-negative form

Simple form	V-ing form
couldn't I crinkle? couldn't you crinkle? couldn't she crinkle? couldn't we crinkle? couldn't you crinkle? couldn't they crinkle?	couldn't I be crinkling? couldn't you be crinkling? couldn't she be crinkling? couldn't we be crinkling? couldn't you be crinkling? couldn't they be crinkling?
Perfect	V-ing perfect
couldn't I have crinkled? couldn't you have crinkled? couldn't she have crinkled? couldn't we have crinkled? couldn't you have crinkled? couldn't they have crinkled?	couldn't I have been crinkling? couldn't you have been crinkling? couldn't she have been crinkling? couldn't we have been crinkling? couldn't you have been crinkling? couldn't they have been crinkling?