English verb conjugation
MUST SCOFF

Regular verb: scoff - scoffed - scoffed

Affirmation

Simple form	V-ing form
I must scoff you must scoff he must scoff we must scoff you must scoff they must scoff	I must be scoffing you must be scoffing he must be scoffing we must be scoffing you must be scoffing they must be scoffing
Perfect	V-ing perfect
I must have scoffed you must have scoffed he must have scoffed we must have scoffed you must have scoffed they must have scoffed	I must have been scoffing you must have been scoffing he must have been scoffing we must have been scoffing you must have been scoffing they must have been scoffing

Negation

Simple form	V-ing form
I mustn't scoff you mustn't scoff he mustn't scoff we mustn't scoff you mustn't scoff they mustn't scoff	I mustn't be scoffing you mustn't be scoffing he mustn't be scoffing we mustn't be scoffing you mustn't be scoffing they mustn't be scoffing
Perfect	V-ing perfect
I mustn't have scoffed you mustn't have scoffed he mustn't have scoffed we mustn't have scoffed you mustn't have scoffed they mustn't have scoffed	I mustn't have been scoffing you mustn't have been scoffing he mustn't have been scoffing we mustn't have been scoffing you mustn't have been scoffing they mustn't have been scoffing

Interrogative form

Simple form	V-ing form
must I scoff? must you scoff? must he scoff? must we scoff? must you scoff? must they scoff?	must I be scoffing? must you be scoffing? must he be scoffing? must we be scoffing? must you be scoffing? must they be scoffing?
Perfect	V-ing perfect
must I have scoffed? must you have scoffed? must he have scoffed? must we have scoffed? must you have scoffed? must they have scoffed?	must I have been scoffing? must you have been scoffing? must he have been scoffing? must we have been scoffing? must you have been scoffing? must they have been scoffing?

Interro-negative form

Simple form	V-ing form
mustn't I scoff? mustn't you scoff? mustn't he scoff? mustn't we scoff? mustn't you scoff? mustn't they scoff?	mustn't I be scoffing? mustn't you be scoffing? mustn't he be scoffing? mustn't we be scoffing? mustn't you be scoffing? mustn't they be scoffing?
Perfect	V-ing perfect
mustn't I have scoffed? mustn't you have scoffed? mustn't he have scoffed? mustn't we have scoffed? mustn't you have scoffed? mustn't they have scoffed?	mustn't I have been scoffing? mustn't you have been scoffing? mustn't he have been scoffing? mustn't we have been scoffing? mustn't you have been scoffing? mustn't they have been scoffing?