must abstract
Verbo regular: abstract - abstracted- abstracted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must abstract
you must abstract
he must abstract
we must abstract
you must abstract
they must abstract 	I must be abstracting
you must be abstracting
he must be abstracting
we must be abstracting
you must be abstracting
they must be abstracting	I must have abstracted
you must have abstracted
he 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
he must have been abstracting
we must have been abstracting
you must have been abstracting
they must have been abstracting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't abstract
you mustn't abstract
he 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
he 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
he 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
he mustn't have been abstracting
we mustn't have been abstracting
you mustn't have been abstracting
they mustn't have been abstracting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I abstract?
must you abstract?
must he abstract?
must we abstract?
must you abstract?
must they abstract? 	must I be abstracting?
must you be abstracting?
must he be abstracting?
must we be abstracting?
must you be abstracting?
must they be abstracting? 	must I have abstracted?
must you have abstracted?
must he 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 he have been abstracting?
must we have been abstracting?
must you have been abstracting?
must they have been abstracting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I abstract?
mustn't you abstract?
mustn't he 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 he 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 he 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 he have been abstracting?
mustn't we have been abstracting?
mustn't you have been abstracting?
mustn't they have been abstracting?