must found
Verbo regular: found - founded- founded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must found
you must found
she must found
we must found
you must found
they must found 	I must be founding
you must be founding
she must be founding
we must be founding
you must be founding
they must be founding	I must have founded
you must have founded
she must have founded
we must have founded
you must have founded
they must have founded	I must have been founding
you must have been founding
she must have been founding
we must have been founding
you must have been founding
they must have been founding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not found
you must not found
she must not found
we must not found
you must not found
they must not found 	I must not be founding
you must not be founding
she must not be founding
we must not be founding
you must not be founding
they must not be founding	I must not have founded
you must not have founded
she must not have founded
we must not have founded
you must not have founded
they must not have founded	I must not have been founding
you must not have been founding
she must not have been founding
we must not have been founding
you must not have been founding
they must not have been founding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I found?
must you found?
must she found?
must we found?
must you found?
must they found? 	must I be founding?
must you be founding?
must she be founding?
must we be founding?
must you be founding?
must they be founding? 	must I have founded?
must you have founded?
must she have founded?
must we have founded?
must you have founded?
must they have founded? 	must I have been founding?
must you have been founding?
must she have been founding?
must we have been founding?
must you have been founding?
must they have been founding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not found?
must you not found?
must she not found?
must we not found?
must you not found?
must they not found? 	must I not be founding?
must you not be founding?
must she not be founding?
must we not be founding?
must you not be founding?
must they not be founding? 	must I not have founded?
must you not have founded?
must she not have founded?
must we not have founded?
must you not have founded?
must they not have founded? 	must I not have been founding?
must you not have been founding?
must she not have been founding?
must we not have been founding?
must you not have been founding?
must they not have been founding?