must suborn
Regular verb: suborn - suborned- suborned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must suborn
you must suborn
he must suborn
we must suborn
you must suborn
they must suborn 	I must be suborning
you must be suborning
he must be suborning
we must be suborning
you must be suborning
they must be suborning	I must have suborned
you must have suborned
he must have suborned
we must have suborned
you must have suborned
they must have suborned	I must have been suborning
you must have been suborning
he must have been suborning
we must have been suborning
you must have been suborning
they must have been suborning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't suborn
you mustn't suborn
he mustn't suborn
we mustn't suborn
you mustn't suborn
they mustn't suborn 	I mustn't be suborning
you mustn't be suborning
he mustn't be suborning
we mustn't be suborning
you mustn't be suborning
they mustn't be suborning	I mustn't have suborned
you mustn't have suborned
he mustn't have suborned
we mustn't have suborned
you mustn't have suborned
they mustn't have suborned	I mustn't have been suborning
you mustn't have been suborning
he mustn't have been suborning
we mustn't have been suborning
you mustn't have been suborning
they mustn't have been suborning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I suborn?
must you suborn?
must he suborn?
must we suborn?
must you suborn?
must they suborn? 	must I be suborning?
must you be suborning?
must he be suborning?
must we be suborning?
must you be suborning?
must they be suborning? 	must I have suborned?
must you have suborned?
must he have suborned?
must we have suborned?
must you have suborned?
must they have suborned? 	must I have been suborning?
must you have been suborning?
must he have been suborning?
must we have been suborning?
must you have been suborning?
must they have been suborning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I suborn?
mustn't you suborn?
mustn't he suborn?
mustn't we suborn?
mustn't you suborn?
mustn't they suborn? 	mustn't I be suborning?
mustn't you be suborning?
mustn't he be suborning?
mustn't we be suborning?
mustn't you be suborning?
mustn't they be suborning? 	mustn't I have suborned?
mustn't you have suborned?
mustn't he have suborned?
mustn't we have suborned?
mustn't you have suborned?
mustn't they have suborned? 	mustn't I have been suborning?
mustn't you have been suborning?
mustn't he have been suborning?
mustn't we have been suborning?
mustn't you have been suborning?
mustn't they have been suborning?