English verb conjugation
MUST TESTIFY

Regular verb: testify - testified - testified

Affirmation

Simple form	V-ing form
I must testify you must testify he must testify we must testify you must testify they must testify	I must be testifying you must be testifying he must be testifying we must be testifying you must be testifying they must be testifying
Perfect	V-ing perfect
I must have testified you must have testified he must have testified we must have testified you must have testified they must have testified	I must have been testifying you must have been testifying he must have been testifying we must have been testifying you must have been testifying they must have been testifying

Negation

Simple form	V-ing form
I must not testify you must not testify he must not testify we must not testify you must not testify they must not testify	I must not be testifying you must not be testifying he must not be testifying we must not be testifying you must not be testifying they must not be testifying
Perfect	V-ing perfect
I must not have testified you must not have testified he must not have testified we must not have testified you must not have testified they must not have testified	I must not have been testifying you must not have been testifying he must not have been testifying we must not have been testifying you must not have been testifying they must not have been testifying

Interrogative form

Simple form	V-ing form
must I testify? must you testify? must he testify? must we testify? must you testify? must they testify?	must I be testifying? must you be testifying? must he be testifying? must we be testifying? must you be testifying? must they be testifying?
Perfect	V-ing perfect
must I have testified? must you have testified? must he have testified? must we have testified? must you have testified? must they have testified?	must I have been testifying? must you have been testifying? must he have been testifying? must we have been testifying? must you have been testifying? must they have been testifying?

Interro-negative form

Simple form	V-ing form
must I not testify? must you not testify? must he not testify? must we not testify? must you not testify? must they not testify?	must I not be testifying? must you not be testifying? must he not be testifying? must we not be testifying? must you not be testifying? must they not be testifying?
Perfect	V-ing perfect
must I not have testified? must you not have testified? must he not have testified? must we not have testified? must you not have testified? must they not have testified?	must I not have been testifying? must you not have been testifying? must he not have been testifying? must we not have been testifying? must you not have been testifying? must they not have been testifying?