must straiten
Regular verb: straiten - straitened- straitened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must straiten
you must straiten
he must straiten
we must straiten
you must straiten
they must straiten 	I must be straitening
you must be straitening
he must be straitening
we must be straitening
you must be straitening
they must be straitening	I must have straitened
you must have straitened
he must have straitened
we must have straitened
you must have straitened
they must have straitened	I must have been straitening
you must have been straitening
he must have been straitening
we must have been straitening
you must have been straitening
they must have been straitening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't straiten
you mustn't straiten
he mustn't straiten
we mustn't straiten
you mustn't straiten
they mustn't straiten 	I mustn't be straitening
you mustn't be straitening
he mustn't be straitening
we mustn't be straitening
you mustn't be straitening
they mustn't be straitening	I mustn't have straitened
you mustn't have straitened
he mustn't have straitened
we mustn't have straitened
you mustn't have straitened
they mustn't have straitened	I mustn't have been straitening
you mustn't have been straitening
he mustn't have been straitening
we mustn't have been straitening
you mustn't have been straitening
they mustn't have been straitening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I straiten?
must you straiten?
must he straiten?
must we straiten?
must you straiten?
must they straiten? 	must I be straitening?
must you be straitening?
must he be straitening?
must we be straitening?
must you be straitening?
must they be straitening? 	must I have straitened?
must you have straitened?
must he have straitened?
must we have straitened?
must you have straitened?
must they have straitened? 	must I have been straitening?
must you have been straitening?
must he have been straitening?
must we have been straitening?
must you have been straitening?
must they have been straitening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I straiten?
mustn't you straiten?
mustn't he straiten?
mustn't we straiten?
mustn't you straiten?
mustn't they straiten? 	mustn't I be straitening?
mustn't you be straitening?
mustn't he be straitening?
mustn't we be straitening?
mustn't you be straitening?
mustn't they be straitening? 	mustn't I have straitened?
mustn't you have straitened?
mustn't he have straitened?
mustn't we have straitened?
mustn't you have straitened?
mustn't they have straitened? 	mustn't I have been straitening?
mustn't you have been straitening?
mustn't he have been straitening?
mustn't we have been straitening?
mustn't you have been straitening?
mustn't they have been straitening?