I must woof you must woof she must woof we must woof you must woof they must woof
V-ing form
I must be woofing you must be woofing she must be woofing we must be woofing you must be woofing they must be woofing
Perfect
I must have woofed you must have woofed she must have woofed we must have woofed you must have woofed they must have woofed
V-ing perfect
I must have been woofing you must have been woofing she must have been woofing we must have been woofing you must have been woofing they must have been woofing
Negation
Simple form
I must not woof you must not woof she must not woof we must not woof you must not woof they must not woof
V-ing form
I must not be woofing you must not be woofing she must not be woofing we must not be woofing you must not be woofing they must not be woofing
Perfect
I must not have woofed you must not have woofed she must not have woofed we must not have woofed you must not have woofed they must not have woofed
V-ing perfect
I must not have been woofing you must not have been woofing she must not have been woofing we must not have been woofing you must not have been woofing they must not have been woofing
Interrogative form
Simple form
must I woof? must you woof? must she woof? must we woof? must you woof? must they woof?
V-ing form
must I be woofing? must you be woofing? must she be woofing? must we be woofing? must you be woofing? must they be woofing?
Perfect
must I have woofed? must you have woofed? must she have woofed? must we have woofed? must you have woofed? must they have woofed?
V-ing perfect
must I have been woofing? must you have been woofing? must she have been woofing? must we have been woofing? must you have been woofing? must they have been woofing?
Interro-negative form
Simple form
must I not woof? must you not woof? must she not woof? must we not woof? must you not woof? must they not woof?
V-ing form
must I not be woofing? must you not be woofing? must she not be woofing? must we not be woofing? must you not be woofing? must they not be woofing?
Perfect
must I not have woofed? must you not have woofed? must she not have woofed? must we not have woofed? must you not have woofed? must they not have woofed?
V-ing perfect
must I not have been woofing? must you not have been woofing? must she not have been woofing? must we not have been woofing? must you not have been woofing? must they not have been woofing?