I can founder you can founder she can founder we can founder you can founder they can founder
V-ing form
I can be foundering you can be foundering she can be foundering we can be foundering you can be foundering they can be foundering
Perfect
I can have foundered you can have foundered she can have foundered we can have foundered you can have foundered they can have foundered
V-ing perfect
I can have been foundering you can have been foundering she can have been foundering we can have been foundering you can have been foundering they can have been foundering
Negation
Simple form
I can't founder you can't founder she can't founder we can't founder you can't founder they can't founder
V-ing form
I can't be foundering you can't be foundering she can't be foundering we can't be foundering you can't be foundering they can't be foundering
Perfect
I can't have foundered you can't have foundered she can't have foundered we can't have foundered you can't have foundered they can't have foundered
V-ing perfect
I can't have been foundering you can't have been foundering she can't have been foundering we can't have been foundering you can't have been foundering they can't have been foundering
Interrogative form
Simple form
can I founder? can you founder? can she founder? can we founder? can you founder? can they founder?
V-ing form
can I be foundering? can you be foundering? can she be foundering? can we be foundering? can you be foundering? can they be foundering?
Perfect
can I have foundered? can you have foundered? can she have foundered? can we have foundered? can you have foundered? can they have foundered?
V-ing perfect
can I have been foundering? can you have been foundering? can she have been foundering? can we have been foundering? can you have been foundering? can they have been foundering?
Interro-negative form
Simple form
can't I founder? can't you founder? can't she founder? can't we founder? can't you founder? can't they founder?
V-ing form
can't I be foundering? can't you be foundering? can't she be foundering? can't we be foundering? can't you be foundering? can't they be foundering?
Perfect
can't I have foundered? can't you have foundered? can't she have foundered? can't we have foundered? can't you have foundered? can't they have foundered?
V-ing perfect
can't I have been foundering? can't you have been foundering? can't she have been foundering? can't we have been foundering? can't you have been foundering? can't they have been foundering?