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 cannot twinkle you cannot twinkle he cannot twinkle we cannot twinkle you cannot twinkle they cannot twinkle
V-ing form
I cannot be twinkling you cannot be twinkling he cannot be twinkling we cannot be twinkling you cannot be twinkling they cannot be twinkling
Perfect
I cannot have twinkled you cannot have twinkled he cannot have twinkled we cannot have twinkled you cannot have twinkled they cannot have twinkled
V-ing perfect
I cannot have been twinkling you cannot have been twinkling he cannot have been twinkling we cannot have been twinkling you cannot have been twinkling they cannot 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 I not twinkle? can you not twinkle? can he not twinkle? can we not twinkle? can you not twinkle? can they not twinkle?
V-ing form
can I not be twinkling? can you not be twinkling? can he not be twinkling? can we not be twinkling? can you not be twinkling? can they not be twinkling?
Perfect
can I not have twinkled? can you not have twinkled? can he not have twinkled? can we not have twinkled? can you not have twinkled? can they not have twinkled?
V-ing perfect
can I not have been twinkling? can you not have been twinkling? can he not have been twinkling? can we not have been twinkling? can you not have been twinkling? can they not have been twinkling?