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 mustn't testify you mustn't testify he mustn't testify we mustn't testify you mustn't testify they mustn't testify	I mustn't be testifying you mustn't be testifying he mustn't be testifying we mustn't be testifying you mustn't be testifying they mustn't be testifying
Perfect	V-ing perfect
I mustn't have testified you mustn't have testified he mustn't have testified we mustn't have testified you mustn't have testified they mustn't have testified	I mustn't have been testifying you mustn't have been testifying he mustn't have been testifying we mustn't have been testifying you mustn't have been testifying they mustn't 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
mustn't I testify? mustn't you testify? mustn't he testify? mustn't we testify? mustn't you testify? mustn't they testify?	mustn't I be testifying? mustn't you be testifying? mustn't he be testifying? mustn't we be testifying? mustn't you be testifying? mustn't they be testifying?
Perfect	V-ing perfect
mustn't I have testified? mustn't you have testified? mustn't he have testified? mustn't we have testified? mustn't you have testified? mustn't they have testified?	mustn't I have been testifying? mustn't you have been testifying? mustn't he have been testifying? mustn't we have been testifying? mustn't you have been testifying? mustn't they have been testifying?