I can twinkle you can twinkle she can twinkle we can twinkle you can twinkle they can twinkle
V-ing form
I can be twinkling you can be twinkling she can be twinkling we can be twinkling you can be twinkling they can be twinkling
Perfect
I can have twinkled you can have twinkled she can have twinkled we can have twinkled you can have twinkled they can have twinkled
V-ing perfect
I can have been twinkling you can have been twinkling she can have been twinkling we can have been twinkling you can have been twinkling they can have been twinkling
Negation
Simple form
I can't twinkle you can't twinkle she can't twinkle we can't twinkle you can't twinkle they can't twinkle
V-ing form
I can't be twinkling you can't be twinkling she can't be twinkling we can't be twinkling you can't be twinkling they can't be twinkling
Perfect
I can't have twinkled you can't have twinkled she can't have twinkled we can't have twinkled you can't have twinkled they can't have twinkled
V-ing perfect
I can't have been twinkling you can't have been twinkling she can't have been twinkling we can't have been twinkling you can't have been twinkling they can't have been twinkling
Interrogative form
Simple form
can I twinkle? can you twinkle? can she twinkle? can we twinkle? can you twinkle? can they twinkle?
V-ing form
can I be twinkling? can you be twinkling? can she be twinkling? can we be twinkling? can you be twinkling? can they be twinkling?
Perfect
can I have twinkled? can you have twinkled? can she have twinkled? can we have twinkled? can you have twinkled? can they have twinkled?
V-ing perfect
can I have been twinkling? can you have been twinkling? can she have been twinkling? can we have been twinkling? can you have been twinkling? can they have been twinkling?
Interro-negative form
Simple form
can't I twinkle? can't you twinkle? can't she twinkle? can't we twinkle? can't you twinkle? can't they twinkle?
V-ing form
can't I be twinkling? can't you be twinkling? can't she be twinkling? can't we be twinkling? can't you be twinkling? can't they be twinkling?
Perfect
can't I have twinkled? can't you have twinkled? can't she have twinkled? can't we have twinkled? can't you have twinkled? can't they have twinkled?
V-ing perfect
can't I have been twinkling? can't you have been twinkling? can't she have been twinkling? can't we have been twinkling? can't you have been twinkling? can't they have been twinkling?