must refill
Regular verb: refill - refilled- refilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must refill
you must refill
she must refill
we must refill
you must refill
they must refill 	I must be refilling
you must be refilling
she must be refilling
we must be refilling
you must be refilling
they must be refilling	I must have refilled
you must have refilled
she must have refilled
we must have refilled
you must have refilled
they must have refilled	I must have been refilling
you must have been refilling
she must have been refilling
we must have been refilling
you must have been refilling
they must have been refilling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't refill
you mustn't refill
she mustn't refill
we mustn't refill
you mustn't refill
they mustn't refill 	I mustn't be refilling
you mustn't be refilling
she mustn't be refilling
we mustn't be refilling
you mustn't be refilling
they mustn't be refilling	I mustn't have refilled
you mustn't have refilled
she mustn't have refilled
we mustn't have refilled
you mustn't have refilled
they mustn't have refilled	I mustn't have been refilling
you mustn't have been refilling
she mustn't have been refilling
we mustn't have been refilling
you mustn't have been refilling
they mustn't have been refilling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I refill?
must you refill?
must she refill?
must we refill?
must you refill?
must they refill? 	must I be refilling?
must you be refilling?
must she be refilling?
must we be refilling?
must you be refilling?
must they be refilling? 	must I have refilled?
must you have refilled?
must she have refilled?
must we have refilled?
must you have refilled?
must they have refilled? 	must I have been refilling?
must you have been refilling?
must she have been refilling?
must we have been refilling?
must you have been refilling?
must they have been refilling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I refill?
mustn't you refill?
mustn't she refill?
mustn't we refill?
mustn't you refill?
mustn't they refill? 	mustn't I be refilling?
mustn't you be refilling?
mustn't she be refilling?
mustn't we be refilling?
mustn't you be refilling?
mustn't they be refilling? 	mustn't I have refilled?
mustn't you have refilled?
mustn't she have refilled?
mustn't we have refilled?
mustn't you have refilled?
mustn't they have refilled? 	mustn't I have been refilling?
mustn't you have been refilling?
mustn't she have been refilling?
mustn't we have been refilling?
mustn't you have been refilling?
mustn't they have been refilling?