I must underexercise you must underexercise he must underexercise we must underexercise you must underexercise they must underexercise
V-ing form
I must be underexercising you must be underexercising he must be underexercising we must be underexercising you must be underexercising they must be underexercising
Perfect
I must have underexercised you must have underexercised he must have underexercised we must have underexercised you must have underexercised they must have underexercised
V-ing perfect
I must have been underexercising you must have been underexercising he must have been underexercising we must have been underexercising you must have been underexercising they must have been underexercising
Negation
Simple form
I must not underexercise you must not underexercise he must not underexercise we must not underexercise you must not underexercise they must not underexercise
V-ing form
I must not be underexercising you must not be underexercising he must not be underexercising we must not be underexercising you must not be underexercising they must not be underexercising
Perfect
I must not have underexercised you must not have underexercised he must not have underexercised we must not have underexercised you must not have underexercised they must not have underexercised
V-ing perfect
I must not have been underexercising you must not have been underexercising he must not have been underexercising we must not have been underexercising you must not have been underexercising they must not have been underexercising
Interrogative form
Simple form
must I underexercise? must you underexercise? must he underexercise? must we underexercise? must you underexercise? must they underexercise?
V-ing form
must I be underexercising? must you be underexercising? must he be underexercising? must we be underexercising? must you be underexercising? must they be underexercising?
Perfect
must I have underexercised? must you have underexercised? must he have underexercised? must we have underexercised? must you have underexercised? must they have underexercised?
V-ing perfect
must I have been underexercising? must you have been underexercising? must he have been underexercising? must we have been underexercising? must you have been underexercising? must they have been underexercising?
Interro-negative form
Simple form
must I not underexercise? must you not underexercise? must he not underexercise? must we not underexercise? must you not underexercise? must they not underexercise?
V-ing form
must I not be underexercising? must you not be underexercising? must he not be underexercising? must we not be underexercising? must you not be underexercising? must they not be underexercising?
Perfect
must I not have underexercised? must you not have underexercised? must he not have underexercised? must we not have underexercised? must you not have underexercised? must they not have underexercised?
V-ing perfect
must I not have been underexercising? must you not have been underexercising? must he not have been underexercising? must we not have been underexercising? must you not have been underexercising? must they not have been underexercising?