can smile
Regular verb: smile - smiled- smiled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can smile
you can smile
he can smile
we can smile
you can smile
they can smile 	I can be smiling
you can be smiling
he can be smiling
we can be smiling
you can be smiling
they can be smiling	I can have smiled
you can have smiled
he can have smiled
we can have smiled
you can have smiled
they can have smiled	I can have been smiling
you can have been smiling
he can have been smiling
we can have been smiling
you can have been smiling
they can have been smiling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot smile
you cannot smile
he cannot smile
we cannot smile
you cannot smile
they cannot smile 	I cannot be smiling
you cannot be smiling
he cannot be smiling
we cannot be smiling
you cannot be smiling
they cannot be smiling	I cannot have smiled
you cannot have smiled
he cannot have smiled
we cannot have smiled
you cannot have smiled
they cannot have smiled	I cannot have been smiling
you cannot have been smiling
he cannot have been smiling
we cannot have been smiling
you cannot have been smiling
they cannot have been smiling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I smile?
can you smile?
can he smile?
can we smile?
can you smile?
can they smile? 	can I be smiling?
can you be smiling?
can he be smiling?
can we be smiling?
can you be smiling?
can they be smiling? 	can I have smiled?
can you have smiled?
can he have smiled?
can we have smiled?
can you have smiled?
can they have smiled? 	can I have been smiling?
can you have been smiling?
can he have been smiling?
can we have been smiling?
can you have been smiling?
can they have been smiling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not smile?
can you not smile?
can he not smile?
can we not smile?
can you not smile?
can they not smile? 	can I not be smiling?
can you not be smiling?
can he not be smiling?
can we not be smiling?
can you not be smiling?
can they not be smiling? 	can I not have smiled?
can you not have smiled?
can he not have smiled?
can we not have smiled?
can you not have smiled?
can they not have smiled? 	can I not have been smiling?
can you not have been smiling?
can he not have been smiling?
can we not have been smiling?
can you not have been smiling?
can they not have been smiling?