must extract
Verbo regular: extract - extracted- extracted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must extract
you must extract
she must extract
we must extract
you must extract
they must extract 	I must be extracting
you must be extracting
she must be extracting
we must be extracting
you must be extracting
they must be extracting	I must have extracted
you must have extracted
she must have extracted
we must have extracted
you must have extracted
they must have extracted	I must have been extracting
you must have been extracting
she must have been extracting
we must have been extracting
you must have been extracting
they must have been extracting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not extract
you must not extract
she must not extract
we must not extract
you must not extract
they must not extract 	I must not be extracting
you must not be extracting
she must not be extracting
we must not be extracting
you must not be extracting
they must not be extracting	I must not have extracted
you must not have extracted
she must not have extracted
we must not have extracted
you must not have extracted
they must not have extracted	I must not have been extracting
you must not have been extracting
she must not have been extracting
we must not have been extracting
you must not have been extracting
they must not have been extracting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I extract?
must you extract?
must she extract?
must we extract?
must you extract?
must they extract? 	must I be extracting?
must you be extracting?
must she be extracting?
must we be extracting?
must you be extracting?
must they be extracting? 	must I have extracted?
must you have extracted?
must she have extracted?
must we have extracted?
must you have extracted?
must they have extracted? 	must I have been extracting?
must you have been extracting?
must she have been extracting?
must we have been extracting?
must you have been extracting?
must they have been extracting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not extract?
must you not extract?
must she not extract?
must we not extract?
must you not extract?
must they not extract? 	must I not be extracting?
must you not be extracting?
must she not be extracting?
must we not be extracting?
must you not be extracting?
must they not be extracting? 	must I not have extracted?
must you not have extracted?
must she not have extracted?
must we not have extracted?
must you not have extracted?
must they not have extracted? 	must I not have been extracting?
must you not have been extracting?
must she not have been extracting?
must we not have been extracting?
must you not have been extracting?
must they not have been extracting?