must forbid
Irregular verb: forbid - forbid, forbade- forbid, forbidden

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must forbid
you must forbid
she must forbid
we must forbid
you must forbid
they must forbid 	I must be forbidding
you must be forbidding
she must be forbidding
we must be forbidding
you must be forbidding
they must be forbidding	I must have forbid, forbidden
you must have forbid, forbidden
she must have forbid, forbidden
we must have forbid, forbidden
you must have forbid, forbidden
they must have forbid, forbidden	I must have been forbidding
you must have been forbidding
she must have been forbidding
we must have been forbidding
you must have been forbidding
they must have been forbidding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't forbid
you mustn't forbid
she mustn't forbid
we mustn't forbid
you mustn't forbid
they mustn't forbid 	I mustn't be forbidding
you mustn't be forbidding
she mustn't be forbidding
we mustn't be forbidding
you mustn't be forbidding
they mustn't be forbidding	I mustn't have forbid, forbidden
you mustn't have forbid, forbidden
she mustn't have forbid, forbidden
we mustn't have forbid, forbidden
you mustn't have forbid, forbidden
they mustn't have forbid, forbidden	I mustn't have been forbidding
you mustn't have been forbidding
she mustn't have been forbidding
we mustn't have been forbidding
you mustn't have been forbidding
they mustn't have been forbidding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I forbid?
must you forbid?
must she forbid?
must we forbid?
must you forbid?
must they forbid? 	must I be forbidding?
must you be forbidding?
must she be forbidding?
must we be forbidding?
must you be forbidding?
must they be forbidding? 	must I have forbid, forbidden?
must you have forbid, forbidden?
must she have forbid, forbidden?
must we have forbid, forbidden?
must you have forbid, forbidden?
must they have forbid, forbidden? 	must I have been forbidding?
must you have been forbidding?
must she have been forbidding?
must we have been forbidding?
must you have been forbidding?
must they have been forbidding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I forbid?
mustn't you forbid?
mustn't she forbid?
mustn't we forbid?
mustn't you forbid?
mustn't they forbid? 	mustn't I be forbidding?
mustn't you be forbidding?
mustn't she be forbidding?
mustn't we be forbidding?
mustn't you be forbidding?
mustn't they be forbidding? 	mustn't I have forbid, forbidden?
mustn't you have forbid, forbidden?
mustn't she have forbid, forbidden?
mustn't we have forbid, forbidden?
mustn't you have forbid, forbidden?
mustn't they have forbid, forbidden? 	mustn't I have been forbidding?
mustn't you have been forbidding?
mustn't she have been forbidding?
mustn't we have been forbidding?
mustn't you have been forbidding?
mustn't they have been forbidding?