English verb conjugation
MUST DEFEND

Regular verb: defend - defended - defended

Affirmation

Simple form	V-ing form
I must defend you must defend he must defend we must defend you must defend they must defend	I must be defending you must be defending he must be defending we must be defending you must be defending they must be defending
Perfect	V-ing perfect
I must have defended you must have defended he must have defended we must have defended you must have defended they must have defended	I must have been defending you must have been defending he must have been defending we must have been defending you must have been defending they must have been defending

Negation

Simple form	V-ing form
I mustn't defend you mustn't defend he mustn't defend we mustn't defend you mustn't defend they mustn't defend	I mustn't be defending you mustn't be defending he mustn't be defending we mustn't be defending you mustn't be defending they mustn't be defending
Perfect	V-ing perfect
I mustn't have defended you mustn't have defended he mustn't have defended we mustn't have defended you mustn't have defended they mustn't have defended	I mustn't have been defending you mustn't have been defending he mustn't have been defending we mustn't have been defending you mustn't have been defending they mustn't have been defending

Interrogative form

Simple form	V-ing form
must I defend? must you defend? must he defend? must we defend? must you defend? must they defend?	must I be defending? must you be defending? must he be defending? must we be defending? must you be defending? must they be defending?
Perfect	V-ing perfect
must I have defended? must you have defended? must he have defended? must we have defended? must you have defended? must they have defended?	must I have been defending? must you have been defending? must he have been defending? must we have been defending? must you have been defending? must they have been defending?

Interro-negative form

Simple form	V-ing form
mustn't I defend? mustn't you defend? mustn't he defend? mustn't we defend? mustn't you defend? mustn't they defend?	mustn't I be defending? mustn't you be defending? mustn't he be defending? mustn't we be defending? mustn't you be defending? mustn't they be defending?
Perfect	V-ing perfect
mustn't I have defended? mustn't you have defended? mustn't he have defended? mustn't we have defended? mustn't you have defended? mustn't they have defended?	mustn't I have been defending? mustn't you have been defending? mustn't he have been defending? mustn't we have been defending? mustn't you have been defending? mustn't they have been defending?