English verb conjugation
CAN SMOKE

Regular verb: smoke - smoked - smoked

Affirmation

Simple form	V-ing form
I can smoke you can smoke he can smoke we can smoke you can smoke they can smoke	I can be smoking you can be smoking he can be smoking we can be smoking you can be smoking they can be smoking
Perfect	V-ing perfect
I can have smoked you can have smoked he can have smoked we can have smoked you can have smoked they can have smoked	I can have been smoking you can have been smoking he can have been smoking we can have been smoking you can have been smoking they can have been smoking

Negation

Simple form	V-ing form
I can't smoke you can't smoke he can't smoke we can't smoke you can't smoke they can't smoke	I can't be smoking you can't be smoking he can't be smoking we can't be smoking you can't be smoking they can't be smoking
Perfect	V-ing perfect
I can't have smoked you can't have smoked he can't have smoked we can't have smoked you can't have smoked they can't have smoked	I can't have been smoking you can't have been smoking he can't have been smoking we can't have been smoking you can't have been smoking they can't have been smoking

Interrogative form

Simple form	V-ing form
can I smoke? can you smoke? can he smoke? can we smoke? can you smoke? can they smoke?	can I be smoking? can you be smoking? can he be smoking? can we be smoking? can you be smoking? can they be smoking?
Perfect	V-ing perfect
can I have smoked? can you have smoked? can he have smoked? can we have smoked? can you have smoked? can they have smoked?	can I have been smoking? can you have been smoking? can he have been smoking? can we have been smoking? can you have been smoking? can they have been smoking?

Interro-negative form

Simple form	V-ing form
can't I smoke? can't you smoke? can't he smoke? can't we smoke? can't you smoke? can't they smoke?	can't I be smoking? can't you be smoking? can't he be smoking? can't we be smoking? can't you be smoking? can't they be smoking?
Perfect	V-ing perfect
can't I have smoked? can't you have smoked? can't he have smoked? can't we have smoked? can't you have smoked? can't they have smoked?	can't I have been smoking? can't you have been smoking? can't he have been smoking? can't we have been smoking? can't you have been smoking? can't they have been smoking?