must found
Regular verb: found - founded- founded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must found
you must found
he must found
we must found
you must found
they must found 	I must be founding
you must be founding
he must be founding
we must be founding
you must be founding
they must be founding	I must have founded
you must have founded
he 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
he must have been founding
we must have been founding
you must have been founding
they must have been founding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not found
you must not found
he 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
he 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
he 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
he must not have been founding
we must not have been founding
you must not have been founding
they must not have been founding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I found?
must you found?
must he found?
must we found?
must you found?
must they found? 	must I be founding?
must you be founding?
must he be founding?
must we be founding?
must you be founding?
must they be founding? 	must I have founded?
must you have founded?
must he 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 he have been founding?
must we have been founding?
must you have been founding?
must they have been founding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not found?
must you not found?
must he 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 he 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 he 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 he not have been founding?
must we not have been founding?
must you not have been founding?
must they not have been founding?