I can twinkle you can twinkle he can twinkle we can twinkle you can twinkle they can twinkle
V-ing form
I can be twinkling you can be twinkling he can be twinkling we can be twinkling you can be twinkling they can be twinkling
Perfect
I can have twinkled you can have twinkled he 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 he 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 he 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 he 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 he 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 he 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 he twinkle? can we twinkle? can you twinkle? can they twinkle?
V-ing form
can I be twinkling? can you be twinkling? can he be twinkling? can we be twinkling? can you be twinkling? can they be twinkling?
Perfect
can I have twinkled? can you have twinkled? can he 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 he 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 he 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 he 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 he 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 he have been twinkling? can't we have been twinkling? can't you have been twinkling? can't they have been twinkling?