I can crinkle you can crinkle she can crinkle we can crinkle you can crinkle they can crinkle
V-ing form
I can be crinkling you can be crinkling she can be crinkling we can be crinkling you can be crinkling they can be crinkling
Perfect
I can have crinkled you can have crinkled she can have crinkled we can have crinkled you can have crinkled they can have crinkled
V-ing perfect
I can have been crinkling you can have been crinkling she can have been crinkling we can have been crinkling you can have been crinkling they can have been crinkling
Negation
Simple form
I cannot crinkle you cannot crinkle she cannot crinkle we cannot crinkle you cannot crinkle they cannot crinkle
V-ing form
I cannot be crinkling you cannot be crinkling she cannot be crinkling we cannot be crinkling you cannot be crinkling they cannot be crinkling
Perfect
I cannot have crinkled you cannot have crinkled she cannot have crinkled we cannot have crinkled you cannot have crinkled they cannot have crinkled
V-ing perfect
I cannot have been crinkling you cannot have been crinkling she cannot have been crinkling we cannot have been crinkling you cannot have been crinkling they cannot have been crinkling
Interrogative form
Simple form
can I crinkle? can you crinkle? can she crinkle? can we crinkle? can you crinkle? can they crinkle?
V-ing form
can I be crinkling? can you be crinkling? can she be crinkling? can we be crinkling? can you be crinkling? can they be crinkling?
Perfect
can I have crinkled? can you have crinkled? can she have crinkled? can we have crinkled? can you have crinkled? can they have crinkled?
V-ing perfect
can I have been crinkling? can you have been crinkling? can she have been crinkling? can we have been crinkling? can you have been crinkling? can they have been crinkling?
Interro-negative form
Simple form
can I not crinkle? can you not crinkle? can she not crinkle? can we not crinkle? can you not crinkle? can they not crinkle?
V-ing form
can I not be crinkling? can you not be crinkling? can she not be crinkling? can we not be crinkling? can you not be crinkling? can they not be crinkling?
Perfect
can I not have crinkled? can you not have crinkled? can she not have crinkled? can we not have crinkled? can you not have crinkled? can they not have crinkled?
V-ing perfect
can I not have been crinkling? can you not have been crinkling? can she not have been crinkling? can we not have been crinkling? can you not have been crinkling? can they not have been crinkling?