I must engineer you must engineer he must engineer we must engineer you must engineer they must engineer
Forme en V-ing
I must be engineering you must be engineering he must be engineering we must be engineering you must be engineering they must be engineering
Perfect
I must have engineered you must have engineered he must have engineered we must have engineered you must have engineered they must have engineered
Perfect en V-ing
I must have been engineering you must have been engineering he must have been engineering we must have been engineering you must have been engineering they must have been engineering
Négation
Forme simple
I must not engineer you must not engineer he must not engineer we must not engineer you must not engineer they must not engineer
Forme en V-ing
I must not be engineering you must not be engineering he must not be engineering we must not be engineering you must not be engineering they must not be engineering
Perfect
I must not have engineered you must not have engineered he must not have engineered we must not have engineered you must not have engineered they must not have engineered
Perfect en V-ing
I must not have been engineering you must not have been engineering he must not have been engineering we must not have been engineering you must not have been engineering they must not have been engineering
Forme interrogative
Forme simple
must I engineer? must you engineer? must he engineer? must we engineer? must you engineer? must they engineer?
Forme en V-ing
must I be engineering? must you be engineering? must he be engineering? must we be engineering? must you be engineering? must they be engineering?
Perfect
must I have engineered? must you have engineered? must he have engineered? must we have engineered? must you have engineered? must they have engineered?
Perfect en V-ing
must I have been engineering? must you have been engineering? must he have been engineering? must we have been engineering? must you have been engineering? must they have been engineering?
Forme interro-négative
Forme simple
must I not engineer? must you not engineer? must he not engineer? must we not engineer? must you not engineer? must they not engineer?
Forme en V-ing
must I not be engineering? must you not be engineering? must he not be engineering? must we not be engineering? must you not be engineering? must they not be engineering?
Perfect
must I not have engineered? must you not have engineered? must he not have engineered? must we not have engineered? must you not have engineered? must they not have engineered?
Perfect en V-ing
must I not have been engineering? must you not have been engineering? must he not have been engineering? must we not have been engineering? must you not have been engineering? must they not have been engineering?