must found
Regular verb: found - founded- founded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't found
you mustn't found
she mustn't found
we mustn't found
you mustn't found
they mustn't found 	I mustn't be founding
you mustn't be founding
she mustn't be founding
we mustn't be founding
you mustn't be founding
they mustn't be founding	I mustn't have founded
you mustn't have founded
she mustn't have founded
we mustn't have founded
you mustn't have founded
they mustn't have founded	I mustn't have been founding
you mustn't have been founding
she mustn't have been founding
we mustn't have been founding
you mustn't have been founding
they mustn't have been founding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I found?
mustn't you found?
mustn't she found?
mustn't we found?
mustn't you found?
mustn't they found? 	mustn't I be founding?
mustn't you be founding?
mustn't she be founding?
mustn't we be founding?
mustn't you be founding?
mustn't they be founding? 	mustn't I have founded?
mustn't you have founded?
mustn't she have founded?
mustn't we have founded?
mustn't you have founded?
mustn't they have founded? 	mustn't I have been founding?
mustn't you have been founding?
mustn't she have been founding?
mustn't we have been founding?
mustn't you have been founding?
mustn't they have been founding?