English verb conjugation
MUST PLAGUE

Regular verb: plague - plagued - plagued

Affirmation

Simple form	V-ing form
I must plague you must plague he must plague we must plague you must plague they must plague	I must be plaguing you must be plaguing he must be plaguing we must be plaguing you must be plaguing they must be plaguing
Perfect	V-ing perfect
I must have plagued you must have plagued he must have plagued we must have plagued you must have plagued they must have plagued	I must have been plaguing you must have been plaguing he must have been plaguing we must have been plaguing you must have been plaguing they must have been plaguing

Negation

Simple form	V-ing form
I mustn't plague you mustn't plague he mustn't plague we mustn't plague you mustn't plague they mustn't plague	I mustn't be plaguing you mustn't be plaguing he mustn't be plaguing we mustn't be plaguing you mustn't be plaguing they mustn't be plaguing
Perfect	V-ing perfect
I mustn't have plagued you mustn't have plagued he mustn't have plagued we mustn't have plagued you mustn't have plagued they mustn't have plagued	I mustn't have been plaguing you mustn't have been plaguing he mustn't have been plaguing we mustn't have been plaguing you mustn't have been plaguing they mustn't have been plaguing

Interrogative form

Simple form	V-ing form
must I plague? must you plague? must he plague? must we plague? must you plague? must they plague?	must I be plaguing? must you be plaguing? must he be plaguing? must we be plaguing? must you be plaguing? must they be plaguing?
Perfect	V-ing perfect
must I have plagued? must you have plagued? must he have plagued? must we have plagued? must you have plagued? must they have plagued?	must I have been plaguing? must you have been plaguing? must he have been plaguing? must we have been plaguing? must you have been plaguing? must they have been plaguing?

Interro-negative form

Simple form	V-ing form
mustn't I plague? mustn't you plague? mustn't he plague? mustn't we plague? mustn't you plague? mustn't they plague?	mustn't I be plaguing? mustn't you be plaguing? mustn't he be plaguing? mustn't we be plaguing? mustn't you be plaguing? mustn't they be plaguing?
Perfect	V-ing perfect
mustn't I have plagued? mustn't you have plagued? mustn't he have plagued? mustn't we have plagued? mustn't you have plagued? mustn't they have plagued?	mustn't I have been plaguing? mustn't you have been plaguing? mustn't he have been plaguing? mustn't we have been plaguing? mustn't you have been plaguing? mustn't they have been plaguing?