Conjugaison du verbe anglais
MUST ASCERTAIN

Verbe régulier : ascertain - ascertained - ascertained
Traduction française : établir - constater

Affirmation

Forme simple	Forme en V-ing
I must ascertain you must ascertain he must ascertain we must ascertain you must ascertain they must ascertain	I must be ascertaining you must be ascertaining he must be ascertaining we must be ascertaining you must be ascertaining they must be ascertaining
Perfect	Perfect en V-ing
I must have ascertained you must have ascertained he must have ascertained we must have ascertained you must have ascertained they must have ascertained	I must have been ascertaining you must have been ascertaining he must have been ascertaining we must have been ascertaining you must have been ascertaining they must have been ascertaining

Négation

Forme simple	Forme en V-ing
I must not ascertain you must not ascertain he must not ascertain we must not ascertain you must not ascertain they must not ascertain	I must not be ascertaining you must not be ascertaining he must not be ascertaining we must not be ascertaining you must not be ascertaining they must not be ascertaining
Perfect	Perfect en V-ing
I must not have ascertained you must not have ascertained he must not have ascertained we must not have ascertained you must not have ascertained they must not have ascertained	I must not have been ascertaining you must not have been ascertaining he must not have been ascertaining we must not have been ascertaining you must not have been ascertaining they must not have been ascertaining

Forme interrogative

Forme simple	Forme en V-ing
must I ascertain? must you ascertain? must he ascertain? must we ascertain? must you ascertain? must they ascertain?	must I be ascertaining? must you be ascertaining? must he be ascertaining? must we be ascertaining? must you be ascertaining? must they be ascertaining?
Perfect	Perfect en V-ing
must I have ascertained? must you have ascertained? must he have ascertained? must we have ascertained? must you have ascertained? must they have ascertained?	must I have been ascertaining? must you have been ascertaining? must he have been ascertaining? must we have been ascertaining? must you have been ascertaining? must they have been ascertaining?

Forme interro-négative

Forme simple	Forme en V-ing
must I not ascertain? must you not ascertain? must he not ascertain? must we not ascertain? must you not ascertain? must they not ascertain?	must I not be ascertaining? must you not be ascertaining? must he not be ascertaining? must we not be ascertaining? must you not be ascertaining? must they not be ascertaining?
Perfect	Perfect en V-ing
must I not have ascertained? must you not have ascertained? must he not have ascertained? must we not have ascertained? must you not have ascertained? must they not have ascertained?	must I not have been ascertaining? must you not have been ascertaining? must he not have been ascertaining? must we not have been ascertaining? must you not have been ascertaining? must they not have been ascertaining?