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 must not forbid
you must not forbid
she must not forbid
we must not forbid
you must not forbid
they must not forbid 	I must not be forbidding
you must not be forbidding
she must not be forbidding
we must not be forbidding
you must not be forbidding
they must not be forbidding	I must not have forbid, forbidden
you must not have forbid, forbidden
she must not have forbid, forbidden
we must not have forbid, forbidden
you must not have forbid, forbidden
they must not have forbid, forbidden	I must not have been forbidding
you must not have been forbidding
she must not have been forbidding
we must not have been forbidding
you must not have been forbidding
they must not 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 	
must I not forbid?
must you not forbid?
must she not forbid?
must we not forbid?
must you not forbid?
must they not forbid? 	must I not be forbidding?
must you not be forbidding?
must she not be forbidding?
must we not be forbidding?
must you not be forbidding?
must they not be forbidding? 	must I not have forbid, forbidden?
must you not have forbid, forbidden?
must she not have forbid, forbidden?
must we not have forbid, forbidden?
must you not have forbid, forbidden?
must they not have forbid, forbidden? 	must I not have been forbidding?
must you not have been forbidding?
must she not have been forbidding?
must we not have been forbidding?
must you not have been forbidding?
must they not have been forbidding?