I can foam you can foam she can foam we can foam you can foam they can foam
V-ing form
I can be foaming you can be foaming she can be foaming we can be foaming you can be foaming they can be foaming
Perfect
I can have foamed you can have foamed she 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 she 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 she 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 she 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 she 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 she 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 she foam? can we foam? can you foam? can they foam?
V-ing form
can I be foaming? can you be foaming? can she be foaming? can we be foaming? can you be foaming? can they be foaming?
Perfect
can I have foamed? can you have foamed? can she 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 she 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 she 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 she 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 she 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 she have been foaming? can't we have been foaming? can't you have been foaming? can't they have been foaming?