must maintain
Regular verb: maintain - maintained- maintained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must maintain
you must maintain
he must maintain
we must maintain
you must maintain
they must maintain 	I must be maintaining
you must be maintaining
he must be maintaining
we must be maintaining
you must be maintaining
they must be maintaining	I must have maintained
you must have maintained
he must have maintained
we must have maintained
you must have maintained
they must have maintained	I must have been maintaining
you must have been maintaining
he must have been maintaining
we must have been maintaining
you must have been maintaining
they must have been maintaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't maintain
you mustn't maintain
he mustn't maintain
we mustn't maintain
you mustn't maintain
they mustn't maintain 	I mustn't be maintaining
you mustn't be maintaining
he mustn't be maintaining
we mustn't be maintaining
you mustn't be maintaining
they mustn't be maintaining	I mustn't have maintained
you mustn't have maintained
he mustn't have maintained
we mustn't have maintained
you mustn't have maintained
they mustn't have maintained	I mustn't have been maintaining
you mustn't have been maintaining
he mustn't have been maintaining
we mustn't have been maintaining
you mustn't have been maintaining
they mustn't have been maintaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I maintain?
must you maintain?
must he maintain?
must we maintain?
must you maintain?
must they maintain? 	must I be maintaining?
must you be maintaining?
must he be maintaining?
must we be maintaining?
must you be maintaining?
must they be maintaining? 	must I have maintained?
must you have maintained?
must he have maintained?
must we have maintained?
must you have maintained?
must they have maintained? 	must I have been maintaining?
must you have been maintaining?
must he have been maintaining?
must we have been maintaining?
must you have been maintaining?
must they have been maintaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I maintain?
mustn't you maintain?
mustn't he maintain?
mustn't we maintain?
mustn't you maintain?
mustn't they maintain? 	mustn't I be maintaining?
mustn't you be maintaining?
mustn't he be maintaining?
mustn't we be maintaining?
mustn't you be maintaining?
mustn't they be maintaining? 	mustn't I have maintained?
mustn't you have maintained?
mustn't he have maintained?
mustn't we have maintained?
mustn't you have maintained?
mustn't they have maintained? 	mustn't I have been maintaining?
mustn't you have been maintaining?
mustn't he have been maintaining?
mustn't we have been maintaining?
mustn't you have been maintaining?
mustn't they have been maintaining?