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 cannot founder you cannot founder she cannot founder we cannot founder you cannot founder they cannot founder
V-ing form
I cannot be foundering you cannot be foundering she cannot be foundering we cannot be foundering you cannot be foundering they cannot be foundering
Perfect
I cannot have foundered you cannot have foundered she cannot have foundered we cannot have foundered you cannot have foundered they cannot have foundered
V-ing perfect
I cannot have been foundering you cannot have been foundering she cannot have been foundering we cannot have been foundering you cannot have been foundering they cannot 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 I not founder? can you not founder? can she not founder? can we not founder? can you not founder? can they not founder?
V-ing form
can I not be foundering? can you not be foundering? can she not be foundering? can we not be foundering? can you not be foundering? can they not be foundering?
Perfect
can I not have foundered? can you not have foundered? can she not have foundered? can we not have foundered? can you not have foundered? can they not have foundered?
V-ing perfect
can I not have been foundering? can you not have been foundering? can she not have been foundering? can we not have been foundering? can you not have been foundering? can they not have been foundering?