I must founder you must founder he must founder we must founder you must founder they must founder
Forme en V-ing
I must be foundering you must be foundering he must be foundering we must be foundering you must be foundering they must be foundering
Perfect
I must have foundered you must have foundered he must have foundered we must have foundered you must have foundered they must have foundered
Perfect en V-ing
I must have been foundering you must have been foundering he must have been foundering we must have been foundering you must have been foundering they must have been foundering
Négation
Forme simple
I must not founder you must not founder he must not founder we must not founder you must not founder they must not founder
Forme en V-ing
I must not be foundering you must not be foundering he must not be foundering we must not be foundering you must not be foundering they must not be foundering
Perfect
I must not have foundered you must not have foundered he must not have foundered we must not have foundered you must not have foundered they must not have foundered
Perfect en V-ing
I must not have been foundering you must not have been foundering he must not have been foundering we must not have been foundering you must not have been foundering they must not have been foundering
Forme interrogative
Forme simple
must I founder? must you founder? must he founder? must we founder? must you founder? must they founder?
Forme en V-ing
must I be foundering? must you be foundering? must he be foundering? must we be foundering? must you be foundering? must they be foundering?
Perfect
must I have foundered? must you have foundered? must he have foundered? must we have foundered? must you have foundered? must they have foundered?
Perfect en V-ing
must I have been foundering? must you have been foundering? must he have been foundering? must we have been foundering? must you have been foundering? must they have been foundering?
Forme interro-négative
Forme simple
must I not founder? must you not founder? must he not founder? must we not founder? must you not founder? must they not founder?
Forme en V-ing
must I not be foundering? must you not be foundering? must he not be foundering? must we not be foundering? must you not be foundering? must they not be foundering?
Perfect
must I not have foundered? must you not have foundered? must he not have foundered? must we not have foundered? must you not have foundered? must they not have foundered?
Perfect en V-ing
must I not have been foundering? must you not have been foundering? must he not have been foundering? must we not have been foundering? must you not have been foundering? must they not have been foundering?