English verb conjugation
MUST INVALIDATE

Regular verb: invalidate - invalidated - invalidated

Affirmation

Simple form	V-ing form
I must invalidate you must invalidate he must invalidate we must invalidate you must invalidate they must invalidate	I must be invalidating you must be invalidating he must be invalidating we must be invalidating you must be invalidating they must be invalidating
Perfect	V-ing perfect
I must have invalidated you must have invalidated he must have invalidated we must have invalidated you must have invalidated they must have invalidated	I must have been invalidating you must have been invalidating he must have been invalidating we must have been invalidating you must have been invalidating they must have been invalidating

Negation

Simple form	V-ing form
I must not invalidate you must not invalidate he must not invalidate we must not invalidate you must not invalidate they must not invalidate	I must not be invalidating you must not be invalidating he must not be invalidating we must not be invalidating you must not be invalidating they must not be invalidating
Perfect	V-ing perfect
I must not have invalidated you must not have invalidated he must not have invalidated we must not have invalidated you must not have invalidated they must not have invalidated	I must not have been invalidating you must not have been invalidating he must not have been invalidating we must not have been invalidating you must not have been invalidating they must not have been invalidating

Interrogative form

Simple form	V-ing form
must I invalidate? must you invalidate? must he invalidate? must we invalidate? must you invalidate? must they invalidate?	must I be invalidating? must you be invalidating? must he be invalidating? must we be invalidating? must you be invalidating? must they be invalidating?
Perfect	V-ing perfect
must I have invalidated? must you have invalidated? must he have invalidated? must we have invalidated? must you have invalidated? must they have invalidated?	must I have been invalidating? must you have been invalidating? must he have been invalidating? must we have been invalidating? must you have been invalidating? must they have been invalidating?

Interro-negative form

Simple form	V-ing form
must I not invalidate? must you not invalidate? must he not invalidate? must we not invalidate? must you not invalidate? must they not invalidate?	must I not be invalidating? must you not be invalidating? must he not be invalidating? must we not be invalidating? must you not be invalidating? must they not be invalidating?
Perfect	V-ing perfect
must I not have invalidated? must you not have invalidated? must he not have invalidated? must we not have invalidated? must you not have invalidated? must they not have invalidated?	must I not have been invalidating? must you not have been invalidating? must he not have been invalidating? must we not have been invalidating? must you not have been invalidating? must they not have been invalidating?