must perfuse
Regular verb: perfuse - perfused- perfused

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must perfuse
you must perfuse
he must perfuse
we must perfuse
you must perfuse
they must perfuse 	I must be perfusing
you must be perfusing
he must be perfusing
we must be perfusing
you must be perfusing
they must be perfusing	I must have perfused
you must have perfused
he must have perfused
we must have perfused
you must have perfused
they must have perfused	I must have been perfusing
you must have been perfusing
he must have been perfusing
we must have been perfusing
you must have been perfusing
they must have been perfusing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't perfuse
you mustn't perfuse
he mustn't perfuse
we mustn't perfuse
you mustn't perfuse
they mustn't perfuse 	I mustn't be perfusing
you mustn't be perfusing
he mustn't be perfusing
we mustn't be perfusing
you mustn't be perfusing
they mustn't be perfusing	I mustn't have perfused
you mustn't have perfused
he mustn't have perfused
we mustn't have perfused
you mustn't have perfused
they mustn't have perfused	I mustn't have been perfusing
you mustn't have been perfusing
he mustn't have been perfusing
we mustn't have been perfusing
you mustn't have been perfusing
they mustn't have been perfusing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I perfuse?
must you perfuse?
must he perfuse?
must we perfuse?
must you perfuse?
must they perfuse? 	must I be perfusing?
must you be perfusing?
must he be perfusing?
must we be perfusing?
must you be perfusing?
must they be perfusing? 	must I have perfused?
must you have perfused?
must he have perfused?
must we have perfused?
must you have perfused?
must they have perfused? 	must I have been perfusing?
must you have been perfusing?
must he have been perfusing?
must we have been perfusing?
must you have been perfusing?
must they have been perfusing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I perfuse?
mustn't you perfuse?
mustn't he perfuse?
mustn't we perfuse?
mustn't you perfuse?
mustn't they perfuse? 	mustn't I be perfusing?
mustn't you be perfusing?
mustn't he be perfusing?
mustn't we be perfusing?
mustn't you be perfusing?
mustn't they be perfusing? 	mustn't I have perfused?
mustn't you have perfused?
mustn't he have perfused?
mustn't we have perfused?
mustn't you have perfused?
mustn't they have perfused? 	mustn't I have been perfusing?
mustn't you have been perfusing?
mustn't he have been perfusing?
mustn't we have been perfusing?
mustn't you have been perfusing?
mustn't they have been perfusing?