must enforce
Regular verb: enforce - enforced- enforced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must enforce
you must enforce
she must enforce
we must enforce
you must enforce
they must enforce 	I must be enforcing
you must be enforcing
she must be enforcing
we must be enforcing
you must be enforcing
they must be enforcing	I must have enforced
you must have enforced
she must have enforced
we must have enforced
you must have enforced
they must have enforced	I must have been enforcing
you must have been enforcing
she must have been enforcing
we must have been enforcing
you must have been enforcing
they must have been enforcing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't enforce
you mustn't enforce
she mustn't enforce
we mustn't enforce
you mustn't enforce
they mustn't enforce 	I mustn't be enforcing
you mustn't be enforcing
she mustn't be enforcing
we mustn't be enforcing
you mustn't be enforcing
they mustn't be enforcing	I mustn't have enforced
you mustn't have enforced
she mustn't have enforced
we mustn't have enforced
you mustn't have enforced
they mustn't have enforced	I mustn't have been enforcing
you mustn't have been enforcing
she mustn't have been enforcing
we mustn't have been enforcing
you mustn't have been enforcing
they mustn't have been enforcing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I enforce?
must you enforce?
must she enforce?
must we enforce?
must you enforce?
must they enforce? 	must I be enforcing?
must you be enforcing?
must she be enforcing?
must we be enforcing?
must you be enforcing?
must they be enforcing? 	must I have enforced?
must you have enforced?
must she have enforced?
must we have enforced?
must you have enforced?
must they have enforced? 	must I have been enforcing?
must you have been enforcing?
must she have been enforcing?
must we have been enforcing?
must you have been enforcing?
must they have been enforcing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I enforce?
mustn't you enforce?
mustn't she enforce?
mustn't we enforce?
mustn't you enforce?
mustn't they enforce? 	mustn't I be enforcing?
mustn't you be enforcing?
mustn't she be enforcing?
mustn't we be enforcing?
mustn't you be enforcing?
mustn't they be enforcing? 	mustn't I have enforced?
mustn't you have enforced?
mustn't she have enforced?
mustn't we have enforced?
mustn't you have enforced?
mustn't they have enforced? 	mustn't I have been enforcing?
mustn't you have been enforcing?
mustn't she have been enforcing?
mustn't we have been enforcing?
mustn't you have been enforcing?
mustn't they have been enforcing?