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 can't smile you can't smile he can't smile we can't smile you can't smile they can't smile	I can't be smiling you can't be smiling he can't be smiling we can't be smiling you can't be smiling they can't be smiling
Perfect	V-ing perfect
I can't have smiled you can't have smiled he can't have smiled we can't have smiled you can't have smiled they can't have smiled	I can't have been smiling you can't have been smiling he can't have been smiling we can't have been smiling you can't have been smiling they can't 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't I smile? can't you smile? can't he smile? can't we smile? can't you smile? can't they smile?	can't I be smiling? can't you be smiling? can't he be smiling? can't we be smiling? can't you be smiling? can't they be smiling?
Perfect	V-ing perfect
can't I have smiled? can't you have smiled? can't he have smiled? can't we have smiled? can't you have smiled? can't they have smiled?	can't I have been smiling? can't you have been smiling? can't he have been smiling? can't we have been smiling? can't you have been smiling? can't they have been smiling?