must skirl
Regular verb: skirl - skirled- skirled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must skirl
you must skirl
she must skirl
we must skirl
you must skirl
they must skirl 	I must be skirling
you must be skirling
she must be skirling
we must be skirling
you must be skirling
they must be skirling	I must have skirled
you must have skirled
she must have skirled
we must have skirled
you must have skirled
they must have skirled	I must have been skirling
you must have been skirling
she must have been skirling
we must have been skirling
you must have been skirling
they must have been skirling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not skirl
you must not skirl
she must not skirl
we must not skirl
you must not skirl
they must not skirl 	I must not be skirling
you must not be skirling
she must not be skirling
we must not be skirling
you must not be skirling
they must not be skirling	I must not have skirled
you must not have skirled
she must not have skirled
we must not have skirled
you must not have skirled
they must not have skirled	I must not have been skirling
you must not have been skirling
she must not have been skirling
we must not have been skirling
you must not have been skirling
they must not have been skirling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I skirl?
must you skirl?
must she skirl?
must we skirl?
must you skirl?
must they skirl? 	must I be skirling?
must you be skirling?
must she be skirling?
must we be skirling?
must you be skirling?
must they be skirling? 	must I have skirled?
must you have skirled?
must she have skirled?
must we have skirled?
must you have skirled?
must they have skirled? 	must I have been skirling?
must you have been skirling?
must she have been skirling?
must we have been skirling?
must you have been skirling?
must they have been skirling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not skirl?
must you not skirl?
must she not skirl?
must we not skirl?
must you not skirl?
must they not skirl? 	must I not be skirling?
must you not be skirling?
must she not be skirling?
must we not be skirling?
must you not be skirling?
must they not be skirling? 	must I not have skirled?
must you not have skirled?
must she not have skirled?
must we not have skirled?
must you not have skirled?
must they not have skirled? 	must I not have been skirling?
must you not have been skirling?
must she not have been skirling?
must we not have been skirling?
must you not have been skirling?
must they not have been skirling?