must assail
Regular verb: assail - assailed- assailed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must assail
you must assail
she must assail
we must assail
you must assail
they must assail 	I must be assailing
you must be assailing
she must be assailing
we must be assailing
you must be assailing
they must be assailing	I must have assailed
you must have assailed
she must have assailed
we must have assailed
you must have assailed
they must have assailed	I must have been assailing
you must have been assailing
she must have been assailing
we must have been assailing
you must have been assailing
they must have been assailing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't assail
you mustn't assail
she mustn't assail
we mustn't assail
you mustn't assail
they mustn't assail 	I mustn't be assailing
you mustn't be assailing
she mustn't be assailing
we mustn't be assailing
you mustn't be assailing
they mustn't be assailing	I mustn't have assailed
you mustn't have assailed
she mustn't have assailed
we mustn't have assailed
you mustn't have assailed
they mustn't have assailed	I mustn't have been assailing
you mustn't have been assailing
she mustn't have been assailing
we mustn't have been assailing
you mustn't have been assailing
they mustn't have been assailing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I assail?
must you assail?
must she assail?
must we assail?
must you assail?
must they assail? 	must I be assailing?
must you be assailing?
must she be assailing?
must we be assailing?
must you be assailing?
must they be assailing? 	must I have assailed?
must you have assailed?
must she have assailed?
must we have assailed?
must you have assailed?
must they have assailed? 	must I have been assailing?
must you have been assailing?
must she have been assailing?
must we have been assailing?
must you have been assailing?
must they have been assailing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I assail?
mustn't you assail?
mustn't she assail?
mustn't we assail?
mustn't you assail?
mustn't they assail? 	mustn't I be assailing?
mustn't you be assailing?
mustn't she be assailing?
mustn't we be assailing?
mustn't you be assailing?
mustn't they be assailing? 	mustn't I have assailed?
mustn't you have assailed?
mustn't she have assailed?
mustn't we have assailed?
mustn't you have assailed?
mustn't they have assailed? 	mustn't I have been assailing?
mustn't you have been assailing?
mustn't she have been assailing?
mustn't we have been assailing?
mustn't you have been assailing?
mustn't they have been assailing?