must sclaff
Regular verb: sclaff - sclaffed- sclaffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sclaff
you must sclaff
she must sclaff
we must sclaff
you must sclaff
they must sclaff 	I must be sclaffing
you must be sclaffing
she must be sclaffing
we must be sclaffing
you must be sclaffing
they must be sclaffing	I must have sclaffed
you must have sclaffed
she must have sclaffed
we must have sclaffed
you must have sclaffed
they must have sclaffed	I must have been sclaffing
you must have been sclaffing
she must have been sclaffing
we must have been sclaffing
you must have been sclaffing
they must have been sclaffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sclaff
you mustn't sclaff
she mustn't sclaff
we mustn't sclaff
you mustn't sclaff
they mustn't sclaff 	I mustn't be sclaffing
you mustn't be sclaffing
she mustn't be sclaffing
we mustn't be sclaffing
you mustn't be sclaffing
they mustn't be sclaffing	I mustn't have sclaffed
you mustn't have sclaffed
she mustn't have sclaffed
we mustn't have sclaffed
you mustn't have sclaffed
they mustn't have sclaffed	I mustn't have been sclaffing
you mustn't have been sclaffing
she mustn't have been sclaffing
we mustn't have been sclaffing
you mustn't have been sclaffing
they mustn't have been sclaffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sclaff?
must you sclaff?
must she sclaff?
must we sclaff?
must you sclaff?
must they sclaff? 	must I be sclaffing?
must you be sclaffing?
must she be sclaffing?
must we be sclaffing?
must you be sclaffing?
must they be sclaffing? 	must I have sclaffed?
must you have sclaffed?
must she have sclaffed?
must we have sclaffed?
must you have sclaffed?
must they have sclaffed? 	must I have been sclaffing?
must you have been sclaffing?
must she have been sclaffing?
must we have been sclaffing?
must you have been sclaffing?
must they have been sclaffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sclaff?
mustn't you sclaff?
mustn't she sclaff?
mustn't we sclaff?
mustn't you sclaff?
mustn't they sclaff? 	mustn't I be sclaffing?
mustn't you be sclaffing?
mustn't she be sclaffing?
mustn't we be sclaffing?
mustn't you be sclaffing?
mustn't they be sclaffing? 	mustn't I have sclaffed?
mustn't you have sclaffed?
mustn't she have sclaffed?
mustn't we have sclaffed?
mustn't you have sclaffed?
mustn't they have sclaffed? 	mustn't I have been sclaffing?
mustn't you have been sclaffing?
mustn't she have been sclaffing?
mustn't we have been sclaffing?
mustn't you have been sclaffing?
mustn't they have been sclaffing?