must abstract
Regular verb: abstract - abstracted- abstracted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must abstract
you must abstract
she must abstract
we must abstract
you must abstract
they must abstract 	I must be abstracting
you must be abstracting
she must be abstracting
we must be abstracting
you must be abstracting
they must be abstracting	I must have abstracted
you must have abstracted
she must have abstracted
we must have abstracted
you must have abstracted
they must have abstracted	I must have been abstracting
you must have been abstracting
she must have been abstracting
we must have been abstracting
you must have been abstracting
they must have been abstracting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't abstract
you mustn't abstract
she mustn't abstract
we mustn't abstract
you mustn't abstract
they mustn't abstract 	I mustn't be abstracting
you mustn't be abstracting
she mustn't be abstracting
we mustn't be abstracting
you mustn't be abstracting
they mustn't be abstracting	I mustn't have abstracted
you mustn't have abstracted
she mustn't have abstracted
we mustn't have abstracted
you mustn't have abstracted
they mustn't have abstracted	I mustn't have been abstracting
you mustn't have been abstracting
she mustn't have been abstracting
we mustn't have been abstracting
you mustn't have been abstracting
they mustn't have been abstracting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I abstract?
must you abstract?
must she abstract?
must we abstract?
must you abstract?
must they abstract? 	must I be abstracting?
must you be abstracting?
must she be abstracting?
must we be abstracting?
must you be abstracting?
must they be abstracting? 	must I have abstracted?
must you have abstracted?
must she have abstracted?
must we have abstracted?
must you have abstracted?
must they have abstracted? 	must I have been abstracting?
must you have been abstracting?
must she have been abstracting?
must we have been abstracting?
must you have been abstracting?
must they have been abstracting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I abstract?
mustn't you abstract?
mustn't she abstract?
mustn't we abstract?
mustn't you abstract?
mustn't they abstract? 	mustn't I be abstracting?
mustn't you be abstracting?
mustn't she be abstracting?
mustn't we be abstracting?
mustn't you be abstracting?
mustn't they be abstracting? 	mustn't I have abstracted?
mustn't you have abstracted?
mustn't she have abstracted?
mustn't we have abstracted?
mustn't you have abstracted?
mustn't they have abstracted? 	mustn't I have been abstracting?
mustn't you have been abstracting?
mustn't she have been abstracting?
mustn't we have been abstracting?
mustn't you have been abstracting?
mustn't they have been abstracting?