must oblige
Regular verb: oblige - obliged- obliged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must oblige
you must oblige
she must oblige
we must oblige
you must oblige
they must oblige 	I must be obliging
you must be obliging
she must be obliging
we must be obliging
you must be obliging
they must be obliging	I must have obliged
you must have obliged
she must have obliged
we must have obliged
you must have obliged
they must have obliged	I must have been obliging
you must have been obliging
she must have been obliging
we must have been obliging
you must have been obliging
they must have been obliging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't oblige
you mustn't oblige
she mustn't oblige
we mustn't oblige
you mustn't oblige
they mustn't oblige 	I mustn't be obliging
you mustn't be obliging
she mustn't be obliging
we mustn't be obliging
you mustn't be obliging
they mustn't be obliging	I mustn't have obliged
you mustn't have obliged
she mustn't have obliged
we mustn't have obliged
you mustn't have obliged
they mustn't have obliged	I mustn't have been obliging
you mustn't have been obliging
she mustn't have been obliging
we mustn't have been obliging
you mustn't have been obliging
they mustn't have been obliging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I oblige?
must you oblige?
must she oblige?
must we oblige?
must you oblige?
must they oblige? 	must I be obliging?
must you be obliging?
must she be obliging?
must we be obliging?
must you be obliging?
must they be obliging? 	must I have obliged?
must you have obliged?
must she have obliged?
must we have obliged?
must you have obliged?
must they have obliged? 	must I have been obliging?
must you have been obliging?
must she have been obliging?
must we have been obliging?
must you have been obliging?
must they have been obliging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I oblige?
mustn't you oblige?
mustn't she oblige?
mustn't we oblige?
mustn't you oblige?
mustn't they oblige? 	mustn't I be obliging?
mustn't you be obliging?
mustn't she be obliging?
mustn't we be obliging?
mustn't you be obliging?
mustn't they be obliging? 	mustn't I have obliged?
mustn't you have obliged?
mustn't she have obliged?
mustn't we have obliged?
mustn't you have obliged?
mustn't they have obliged? 	mustn't I have been obliging?
mustn't you have been obliging?
mustn't she have been obliging?
mustn't we have been obliging?
mustn't you have been obliging?
mustn't they have been obliging?