must suborn
Regular verb: suborn - suborned- suborned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must suborn
you must suborn
she must suborn
we must suborn
you must suborn
they must suborn 	I must be suborning
you must be suborning
she must be suborning
we must be suborning
you must be suborning
they must be suborning	I must have suborned
you must have suborned
she 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
she 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 must not suborn
you must not suborn
she must not suborn
we must not suborn
you must not suborn
they must not suborn 	I must not be suborning
you must not be suborning
she must not be suborning
we must not be suborning
you must not be suborning
they must not be suborning	I must not have suborned
you must not have suborned
she must not have suborned
we must not have suborned
you must not have suborned
they must not have suborned	I must not have been suborning
you must not have been suborning
she must not have been suborning
we must not have been suborning
you must not have been suborning
they must not have been suborning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I suborn?
must you suborn?
must she suborn?
must we suborn?
must you suborn?
must they suborn? 	must I be suborning?
must you be suborning?
must she be suborning?
must we be suborning?
must you be suborning?
must they be suborning? 	must I have suborned?
must you have suborned?
must she 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 she 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 	
must I not suborn?
must you not suborn?
must she not suborn?
must we not suborn?
must you not suborn?
must they not suborn? 	must I not be suborning?
must you not be suborning?
must she not be suborning?
must we not be suborning?
must you not be suborning?
must they not be suborning? 	must I not have suborned?
must you not have suborned?
must she not have suborned?
must we not have suborned?
must you not have suborned?
must they not have suborned? 	must I not have been suborning?
must you not have been suborning?
must she not have been suborning?
must we not have been suborning?
must you not have been suborning?
must they not have been suborning?