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 can't crinkle you can't crinkle he can't crinkle we can't crinkle you can't crinkle they can't crinkle
V-ing form
I can't be crinkling you can't be crinkling he can't be crinkling we can't be crinkling you can't be crinkling they can't be crinkling
Perfect
I can't have crinkled you can't have crinkled he can't have crinkled we can't have crinkled you can't have crinkled they can't have crinkled
V-ing perfect
I can't have been crinkling you can't have been crinkling he can't have been crinkling we can't have been crinkling you can't have been crinkling they can't 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't I crinkle? can't you crinkle? can't he crinkle? can't we crinkle? can't you crinkle? can't they crinkle?
V-ing form
can't I be crinkling? can't you be crinkling? can't he be crinkling? can't we be crinkling? can't you be crinkling? can't they be crinkling?
Perfect
can't I have crinkled? can't you have crinkled? can't he have crinkled? can't we have crinkled? can't you have crinkled? can't they have crinkled?
V-ing perfect
can't I have been crinkling? can't you have been crinkling? can't he have been crinkling? can't we have been crinkling? can't you have been crinkling? can't they have been crinkling?