Conjugación del verbo inglés
MUST CERTIFY

Verbo regular: certify - certified - certified

Afirmación

Forma simple	Forma con V-ing
I must certify you must certify she must certify we must certify you must certify they must certify	I must be certifying you must be certifying she must be certifying we must be certifying you must be certifying they must be certifying
Perfecto	Perfecto con V-ing
I must have certified you must have certified she must have certified we must have certified you must have certified they must have certified	I must have been certifying you must have been certifying she must have been certifying we must have been certifying you must have been certifying they must have been certifying

Negación

Forma simple	Forma con V-ing
I must not certify you must not certify she must not certify we must not certify you must not certify they must not certify	I must not be certifying you must not be certifying she must not be certifying we must not be certifying you must not be certifying they must not be certifying
Perfecto	Perfecto con V-ing
I must not have certified you must not have certified she must not have certified we must not have certified you must not have certified they must not have certified	I must not have been certifying you must not have been certifying she must not have been certifying we must not have been certifying you must not have been certifying they must not have been certifying

Forma interrogativa

Forma simple	Forma con V-ing
must I certify? must you certify? must she certify? must we certify? must you certify? must they certify?	must I be certifying? must you be certifying? must she be certifying? must we be certifying? must you be certifying? must they be certifying?
Perfecto	Perfecto con V-ing
must I have certified? must you have certified? must she have certified? must we have certified? must you have certified? must they have certified?	must I have been certifying? must you have been certifying? must she have been certifying? must we have been certifying? must you have been certifying? must they have been certifying?

Forma interro-negativa

Forma simple	Forma con V-ing
must I not certify? must you not certify? must she not certify? must we not certify? must you not certify? must they not certify?	must I not be certifying? must you not be certifying? must she not be certifying? must we not be certifying? must you not be certifying? must they not be certifying?
Perfecto	Perfecto con V-ing
must I not have certified? must you not have certified? must she not have certified? must we not have certified? must you not have certified? must they not have certified?	must I not have been certifying? must you not have been certifying? must she not have been certifying? must we not have been certifying? must you not have been certifying? must they not have been certifying?