I can foam you can foam he can foam we can foam you can foam they can foam
V-ing form
I can be foaming you can be foaming he can be foaming we can be foaming you can be foaming they can be foaming
Perfect
I can have foamed you can have foamed he can have foamed we can have foamed you can have foamed they can have foamed
V-ing perfect
I can have been foaming you can have been foaming he can have been foaming we can have been foaming you can have been foaming they can have been foaming
Negation
Simple form
I can't foam you can't foam he can't foam we can't foam you can't foam they can't foam
V-ing form
I can't be foaming you can't be foaming he can't be foaming we can't be foaming you can't be foaming they can't be foaming
Perfect
I can't have foamed you can't have foamed he can't have foamed we can't have foamed you can't have foamed they can't have foamed
V-ing perfect
I can't have been foaming you can't have been foaming he can't have been foaming we can't have been foaming you can't have been foaming they can't have been foaming
Interrogative form
Simple form
can I foam? can you foam? can he foam? can we foam? can you foam? can they foam?
V-ing form
can I be foaming? can you be foaming? can he be foaming? can we be foaming? can you be foaming? can they be foaming?
Perfect
can I have foamed? can you have foamed? can he have foamed? can we have foamed? can you have foamed? can they have foamed?
V-ing perfect
can I have been foaming? can you have been foaming? can he have been foaming? can we have been foaming? can you have been foaming? can they have been foaming?
Interro-negative form
Simple form
can't I foam? can't you foam? can't he foam? can't we foam? can't you foam? can't they foam?
V-ing form
can't I be foaming? can't you be foaming? can't he be foaming? can't we be foaming? can't you be foaming? can't they be foaming?
Perfect
can't I have foamed? can't you have foamed? can't he have foamed? can't we have foamed? can't you have foamed? can't they have foamed?
V-ing perfect
can't I have been foaming? can't you have been foaming? can't he have been foaming? can't we have been foaming? can't you have been foaming? can't they have been foaming?