English verb conjugation
CAN SMILE

Regular verb: smile - smiled - smiled

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?