I must assail you must assail he must assail we must assail you must assail they must assail
V-ing form
I must be assailing you must be assailing he must be assailing we must be assailing you must be assailing they must be assailing
Perfect
I must have assailed you must have assailed he must have assailed we must have assailed you must have assailed they must have assailed
V-ing perfect
I must have been assailing you must have been assailing he must have been assailing we must have been assailing you must have been assailing they must have been assailing
Negation
Simple form
I must not assail you must not assail he must not assail we must not assail you must not assail they must not assail
V-ing form
I must not be assailing you must not be assailing he must not be assailing we must not be assailing you must not be assailing they must not be assailing
Perfect
I must not have assailed you must not have assailed he must not have assailed we must not have assailed you must not have assailed they must not have assailed
V-ing perfect
I must not have been assailing you must not have been assailing he must not have been assailing we must not have been assailing you must not have been assailing they must not have been assailing
Interrogative form
Simple form
must I assail? must you assail? must he assail? must we assail? must you assail? must they assail?
V-ing form
must I be assailing? must you be assailing? must he be assailing? must we be assailing? must you be assailing? must they be assailing?
Perfect
must I have assailed? must you have assailed? must he have assailed? must we have assailed? must you have assailed? must they have assailed?
V-ing perfect
must I have been assailing? must you have been assailing? must he have been assailing? must we have been assailing? must you have been assailing? must they have been assailing?
Interro-negative form
Simple form
must I not assail? must you not assail? must he not assail? must we not assail? must you not assail? must they not assail?
V-ing form
must I not be assailing? must you not be assailing? must he not be assailing? must we not be assailing? must you not be assailing? must they not be assailing?
Perfect
must I not have assailed? must you not have assailed? must he not have assailed? must we not have assailed? must you not have assailed? must they not have assailed?
V-ing perfect
must I not have been assailing? must you not have been assailing? must he not have been assailing? must we not have been assailing? must you not have been assailing? must they not have been assailing?