I can fart you can fart he can fart we can fart you can fart they can fart
V-ing form
I can be farting you can be farting he can be farting we can be farting you can be farting they can be farting
Perfect
I can have farted you can have farted he can have farted we can have farted you can have farted they can have farted
V-ing perfect
I can have been farting you can have been farting he can have been farting we can have been farting you can have been farting they can have been farting
Negation
Simple form
I can't fart you can't fart he can't fart we can't fart you can't fart they can't fart
V-ing form
I can't be farting you can't be farting he can't be farting we can't be farting you can't be farting they can't be farting
Perfect
I can't have farted you can't have farted he can't have farted we can't have farted you can't have farted they can't have farted
V-ing perfect
I can't have been farting you can't have been farting he can't have been farting we can't have been farting you can't have been farting they can't have been farting
Interrogative form
Simple form
can I fart? can you fart? can he fart? can we fart? can you fart? can they fart?
V-ing form
can I be farting? can you be farting? can he be farting? can we be farting? can you be farting? can they be farting?
Perfect
can I have farted? can you have farted? can he have farted? can we have farted? can you have farted? can they have farted?
V-ing perfect
can I have been farting? can you have been farting? can he have been farting? can we have been farting? can you have been farting? can they have been farting?
Interro-negative form
Simple form
can't I fart? can't you fart? can't he fart? can't we fart? can't you fart? can't they fart?
V-ing form
can't I be farting? can't you be farting? can't he be farting? can't we be farting? can't you be farting? can't they be farting?
Perfect
can't I have farted? can't you have farted? can't he have farted? can't we have farted? can't you have farted? can't they have farted?
V-ing perfect
can't I have been farting? can't you have been farting? can't he have been farting? can't we have been farting? can't you have been farting? can't they have been farting?