I must defend you must defend she must defend we must defend you must defend they must defend
V-ing form
I must be defending you must be defending she must be defending we must be defending you must be defending they must be defending
Perfect
I must have defended you must have defended she must have defended we must have defended you must have defended they must have defended
V-ing perfect
I must have been defending you must have been defending she must have been defending we must have been defending you must have been defending they must have been defending
Negation
Simple form
I mustn't defend you mustn't defend she mustn't defend we mustn't defend you mustn't defend they mustn't defend
V-ing form
I mustn't be defending you mustn't be defending she mustn't be defending we mustn't be defending you mustn't be defending they mustn't be defending
Perfect
I mustn't have defended you mustn't have defended she mustn't have defended we mustn't have defended you mustn't have defended they mustn't have defended
V-ing perfect
I mustn't have been defending you mustn't have been defending she 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
must I defend? must you defend? must she defend? must we defend? must you defend? must they defend?
V-ing form
must I be defending? must you be defending? must she be defending? must we be defending? must you be defending? must they be defending?
Perfect
must I have defended? must you have defended? must she have defended? must we have defended? must you have defended? must they have defended?
V-ing perfect
must I have been defending? must you have been defending? must she have been defending? must we have been defending? must you have been defending? must they have been defending?
Interro-negative form
Simple form
mustn't I defend? mustn't you defend? mustn't she defend? mustn't we defend? mustn't you defend? mustn't they defend?
V-ing form
mustn't I be defending? mustn't you be defending? mustn't she be defending? mustn't we be defending? mustn't you be defending? mustn't they be defending?
Perfect
mustn't I have defended? mustn't you have defended? mustn't she have defended? mustn't we have defended? mustn't you have defended? mustn't they have defended?
V-ing perfect
mustn't I have been defending? mustn't you have been defending? mustn't she have been defending? mustn't we have been defending? mustn't you have been defending? mustn't they have been defending?