English verb conjugation
MUST UNDERMINE

Regular verb: undermine - undermined - undermined

Affirmation

Simple form	V-ing form
I must undermine you must undermine he must undermine we must undermine you must undermine they must undermine	I must be undermining you must be undermining he must be undermining we must be undermining you must be undermining they must be undermining
Perfect	V-ing perfect
I must have undermined you must have undermined he must have undermined we must have undermined you must have undermined they must have undermined	I must have been undermining you must have been undermining he must have been undermining we must have been undermining you must have been undermining they must have been undermining

Negation

Simple form	V-ing form
I mustn't undermine you mustn't undermine he mustn't undermine we mustn't undermine you mustn't undermine they mustn't undermine	I mustn't be undermining you mustn't be undermining he mustn't be undermining we mustn't be undermining you mustn't be undermining they mustn't be undermining
Perfect	V-ing perfect
I mustn't have undermined you mustn't have undermined he mustn't have undermined we mustn't have undermined you mustn't have undermined they mustn't have undermined	I mustn't have been undermining you mustn't have been undermining he mustn't have been undermining we mustn't have been undermining you mustn't have been undermining they mustn't have been undermining

Interrogative form

Simple form	V-ing form
must I undermine? must you undermine? must he undermine? must we undermine? must you undermine? must they undermine?	must I be undermining? must you be undermining? must he be undermining? must we be undermining? must you be undermining? must they be undermining?
Perfect	V-ing perfect
must I have undermined? must you have undermined? must he have undermined? must we have undermined? must you have undermined? must they have undermined?	must I have been undermining? must you have been undermining? must he have been undermining? must we have been undermining? must you have been undermining? must they have been undermining?

Interro-negative form

Simple form	V-ing form
mustn't I undermine? mustn't you undermine? mustn't he undermine? mustn't we undermine? mustn't you undermine? mustn't they undermine?	mustn't I be undermining? mustn't you be undermining? mustn't he be undermining? mustn't we be undermining? mustn't you be undermining? mustn't they be undermining?
Perfect	V-ing perfect
mustn't I have undermined? mustn't you have undermined? mustn't he have undermined? mustn't we have undermined? mustn't you have undermined? mustn't they have undermined?	mustn't I have been undermining? mustn't you have been undermining? mustn't he have been undermining? mustn't we have been undermining? mustn't you have been undermining? mustn't they have been undermining?