English verb conjugation
CAN SMILE

Regular verb: smile - smiled - smiled

Affirmation

Simple form	V-ing form
I can smile you can smile she can smile we can smile you can smile they can smile	I can be smiling you can be smiling she 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 she 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 she 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 she 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 she 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 she 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 she 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 she smile? can we smile? can you smile? can they smile?	can I be smiling? can you be smiling? can she 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 she 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 she 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 she 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 she 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 she 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 she have been smiling? can't we have been smiling? can't you have been smiling? can't they have been smiling?