must abstract
Regular verb: abstract - abstracted- abstracted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not abstract
you must not abstract
he must not abstract
we must not abstract
you must not abstract
they must not abstract 	I must not be abstracting
you must not be abstracting
he must not be abstracting
we must not be abstracting
you must not be abstracting
they must not be abstracting	I must not have abstracted
you must not have abstracted
he must not have abstracted
we must not have abstracted
you must not have abstracted
they must not have abstracted	I must not have been abstracting
you must not have been abstracting
he must not have been abstracting
we must not have been abstracting
you must not have been abstracting
they must not have been abstracting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not abstract?
must you not abstract?
must he not abstract?
must we not abstract?
must you not abstract?
must they not abstract? 	must I not be abstracting?
must you not be abstracting?
must he not be abstracting?
must we not be abstracting?
must you not be abstracting?
must they not be abstracting? 	must I not have abstracted?
must you not have abstracted?
must he not have abstracted?
must we not have abstracted?
must you not have abstracted?
must they not have abstracted? 	must I not have been abstracting?
must you not have been abstracting?
must he not have been abstracting?
must we not have been abstracting?
must you not have been abstracting?
must they not have been abstracting?