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 must not refill
you must not refill
she must not refill
we must not refill
you must not refill
they must not refill 	I must not be refilling
you must not be refilling
she must not be refilling
we must not be refilling
you must not be refilling
they must not be refilling	I must not have refilled
you must not have refilled
she must not have refilled
we must not have refilled
you must not have refilled
they must not have refilled	I must not have been refilling
you must not have been refilling
she must not have been refilling
we must not have been refilling
you must not have been refilling
they must not 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 	
must I not refill?
must you not refill?
must she not refill?
must we not refill?
must you not refill?
must they not refill? 	must I not be refilling?
must you not be refilling?
must she not be refilling?
must we not be refilling?
must you not be refilling?
must they not be refilling? 	must I not have refilled?
must you not have refilled?
must she not have refilled?
must we not have refilled?
must you not have refilled?
must they not have refilled? 	must I not have been refilling?
must you not have been refilling?
must she not have been refilling?
must we not have been refilling?
must you not have been refilling?
must they not have been refilling?