I can crinkle you can crinkle he can crinkle we can crinkle you can crinkle they can crinkle
V-ing form
I can be crinkling you can be crinkling he can be crinkling we can be crinkling you can be crinkling they can be crinkling
Perfect
I can have crinkled you can have crinkled he 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 he 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 he cannot crinkle we cannot crinkle you cannot crinkle they cannot crinkle
V-ing form
I cannot be crinkling you cannot be crinkling he cannot be crinkling we cannot be crinkling you cannot be crinkling they cannot be crinkling
Perfect
I cannot have crinkled you cannot have crinkled he 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 he 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 he crinkle? can we crinkle? can you crinkle? can they crinkle?
V-ing form
can I be crinkling? can you be crinkling? can he be crinkling? can we be crinkling? can you be crinkling? can they be crinkling?
Perfect
can I have crinkled? can you have crinkled? can he 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 he 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 he 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 he 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 he 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 he not have been crinkling? can we not have been crinkling? can you not have been crinkling? can they not have been crinkling?