must scull
Regular verb: scull - sculled- sculled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must scull
you must scull
she must scull
we must scull
you must scull
they must scull 	I must be sculling
you must be sculling
she must be sculling
we must be sculling
you must be sculling
they must be sculling	I must have sculled
you must have sculled
she must have sculled
we must have sculled
you must have sculled
they must have sculled	I must have been sculling
you must have been sculling
she must have been sculling
we must have been sculling
you must have been sculling
they must have been sculling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not scull
you must not scull
she must not scull
we must not scull
you must not scull
they must not scull 	I must not be sculling
you must not be sculling
she must not be sculling
we must not be sculling
you must not be sculling
they must not be sculling	I must not have sculled
you must not have sculled
she must not have sculled
we must not have sculled
you must not have sculled
they must not have sculled	I must not have been sculling
you must not have been sculling
she must not have been sculling
we must not have been sculling
you must not have been sculling
they must not have been sculling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I scull?
must you scull?
must she scull?
must we scull?
must you scull?
must they scull? 	must I be sculling?
must you be sculling?
must she be sculling?
must we be sculling?
must you be sculling?
must they be sculling? 	must I have sculled?
must you have sculled?
must she have sculled?
must we have sculled?
must you have sculled?
must they have sculled? 	must I have been sculling?
must you have been sculling?
must she have been sculling?
must we have been sculling?
must you have been sculling?
must they have been sculling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not scull?
must you not scull?
must she not scull?
must we not scull?
must you not scull?
must they not scull? 	must I not be sculling?
must you not be sculling?
must she not be sculling?
must we not be sculling?
must you not be sculling?
must they not be sculling? 	must I not have sculled?
must you not have sculled?
must she not have sculled?
must we not have sculled?
must you not have sculled?
must they not have sculled? 	must I not have been sculling?
must you not have been sculling?
must she not have been sculling?
must we not have been sculling?
must you not have been sculling?
must they not have been sculling?