English verb conjugation
MUST ROOF

Regular verb: roof - roofed - roofed

Affirmation

Simple form	V-ing form
I must roof you must roof he must roof we must roof you must roof they must roof	I must be roofing you must be roofing he must be roofing we must be roofing you must be roofing they must be roofing
Perfect	V-ing perfect
I must have roofed you must have roofed he must have roofed we must have roofed you must have roofed they must have roofed	I must have been roofing you must have been roofing he must have been roofing we must have been roofing you must have been roofing they must have been roofing

Negation

Simple form	V-ing form
I mustn't roof you mustn't roof he mustn't roof we mustn't roof you mustn't roof they mustn't roof	I mustn't be roofing you mustn't be roofing he mustn't be roofing we mustn't be roofing you mustn't be roofing they mustn't be roofing
Perfect	V-ing perfect
I mustn't have roofed you mustn't have roofed he mustn't have roofed we mustn't have roofed you mustn't have roofed they mustn't have roofed	I mustn't have been roofing you mustn't have been roofing he mustn't have been roofing we mustn't have been roofing you mustn't have been roofing they mustn't have been roofing

Interrogative form

Simple form	V-ing form
must I roof? must you roof? must he roof? must we roof? must you roof? must they roof?	must I be roofing? must you be roofing? must he be roofing? must we be roofing? must you be roofing? must they be roofing?
Perfect	V-ing perfect
must I have roofed? must you have roofed? must he have roofed? must we have roofed? must you have roofed? must they have roofed?	must I have been roofing? must you have been roofing? must he have been roofing? must we have been roofing? must you have been roofing? must they have been roofing?

Interro-negative form

Simple form	V-ing form
mustn't I roof? mustn't you roof? mustn't he roof? mustn't we roof? mustn't you roof? mustn't they roof?	mustn't I be roofing? mustn't you be roofing? mustn't he be roofing? mustn't we be roofing? mustn't you be roofing? mustn't they be roofing?
Perfect	V-ing perfect
mustn't I have roofed? mustn't you have roofed? mustn't he have roofed? mustn't we have roofed? mustn't you have roofed? mustn't they have roofed?	mustn't I have been roofing? mustn't you have been roofing? mustn't he have been roofing? mustn't we have been roofing? mustn't you have been roofing? mustn't they have been roofing?