must strap
Regular verb: strap - strapped- strapped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must strap
you must strap
she must strap
we must strap
you must strap
they must strap 	I must be strapping
you must be strapping
she must be strapping
we must be strapping
you must be strapping
they must be strapping	I must have strapped
you must have strapped
she must have strapped
we must have strapped
you must have strapped
they must have strapped	I must have been strapping
you must have been strapping
she must have been strapping
we must have been strapping
you must have been strapping
they must have been strapping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't strap
you mustn't strap
she mustn't strap
we mustn't strap
you mustn't strap
they mustn't strap 	I mustn't be strapping
you mustn't be strapping
she mustn't be strapping
we mustn't be strapping
you mustn't be strapping
they mustn't be strapping	I mustn't have strapped
you mustn't have strapped
she mustn't have strapped
we mustn't have strapped
you mustn't have strapped
they mustn't have strapped	I mustn't have been strapping
you mustn't have been strapping
she mustn't have been strapping
we mustn't have been strapping
you mustn't have been strapping
they mustn't have been strapping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I strap?
must you strap?
must she strap?
must we strap?
must you strap?
must they strap? 	must I be strapping?
must you be strapping?
must she be strapping?
must we be strapping?
must you be strapping?
must they be strapping? 	must I have strapped?
must you have strapped?
must she have strapped?
must we have strapped?
must you have strapped?
must they have strapped? 	must I have been strapping?
must you have been strapping?
must she have been strapping?
must we have been strapping?
must you have been strapping?
must they have been strapping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I strap?
mustn't you strap?
mustn't she strap?
mustn't we strap?
mustn't you strap?
mustn't they strap? 	mustn't I be strapping?
mustn't you be strapping?
mustn't she be strapping?
mustn't we be strapping?
mustn't you be strapping?
mustn't they be strapping? 	mustn't I have strapped?
mustn't you have strapped?
mustn't she have strapped?
mustn't we have strapped?
mustn't you have strapped?
mustn't they have strapped? 	mustn't I have been strapping?
mustn't you have been strapping?
mustn't she have been strapping?
mustn't we have been strapping?
mustn't you have been strapping?
mustn't they have been strapping?