must raven
Regular verb: raven - ravened- ravened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must raven
you must raven
he must raven
we must raven
you must raven
they must raven 	I must be ravening
you must be ravening
he must be ravening
we must be ravening
you must be ravening
they must be ravening	I must have ravened
you must have ravened
he must have ravened
we must have ravened
you must have ravened
they must have ravened	I must have been ravening
you must have been ravening
he must have been ravening
we must have been ravening
you must have been ravening
they must have been ravening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't raven
you mustn't raven
he mustn't raven
we mustn't raven
you mustn't raven
they mustn't raven 	I mustn't be ravening
you mustn't be ravening
he mustn't be ravening
we mustn't be ravening
you mustn't be ravening
they mustn't be ravening	I mustn't have ravened
you mustn't have ravened
he mustn't have ravened
we mustn't have ravened
you mustn't have ravened
they mustn't have ravened	I mustn't have been ravening
you mustn't have been ravening
he mustn't have been ravening
we mustn't have been ravening
you mustn't have been ravening
they mustn't have been ravening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I raven?
must you raven?
must he raven?
must we raven?
must you raven?
must they raven? 	must I be ravening?
must you be ravening?
must he be ravening?
must we be ravening?
must you be ravening?
must they be ravening? 	must I have ravened?
must you have ravened?
must he have ravened?
must we have ravened?
must you have ravened?
must they have ravened? 	must I have been ravening?
must you have been ravening?
must he have been ravening?
must we have been ravening?
must you have been ravening?
must they have been ravening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I raven?
mustn't you raven?
mustn't he raven?
mustn't we raven?
mustn't you raven?
mustn't they raven? 	mustn't I be ravening?
mustn't you be ravening?
mustn't he be ravening?
mustn't we be ravening?
mustn't you be ravening?
mustn't they be ravening? 	mustn't I have ravened?
mustn't you have ravened?
mustn't he have ravened?
mustn't we have ravened?
mustn't you have ravened?
mustn't they have ravened? 	mustn't I have been ravening?
mustn't you have been ravening?
mustn't he have been ravening?
mustn't we have been ravening?
mustn't you have been ravening?
mustn't they have been ravening?