I must underproduce you must underproduce he must underproduce we must underproduce you must underproduce they must underproduce
V-ing form
I must be underproducing you must be underproducing he must be underproducing we must be underproducing you must be underproducing they must be underproducing
Perfect
I must have underproduced you must have underproduced he must have underproduced we must have underproduced you must have underproduced they must have underproduced
V-ing perfect
I must have been underproducing you must have been underproducing he must have been underproducing we must have been underproducing you must have been underproducing they must have been underproducing
Negation
Simple form
I must not underproduce you must not underproduce he must not underproduce we must not underproduce you must not underproduce they must not underproduce
V-ing form
I must not be underproducing you must not be underproducing he must not be underproducing we must not be underproducing you must not be underproducing they must not be underproducing
Perfect
I must not have underproduced you must not have underproduced he must not have underproduced we must not have underproduced you must not have underproduced they must not have underproduced
V-ing perfect
I must not have been underproducing you must not have been underproducing he must not have been underproducing we must not have been underproducing you must not have been underproducing they must not have been underproducing
Interrogative form
Simple form
must I underproduce? must you underproduce? must he underproduce? must we underproduce? must you underproduce? must they underproduce?
V-ing form
must I be underproducing? must you be underproducing? must he be underproducing? must we be underproducing? must you be underproducing? must they be underproducing?
Perfect
must I have underproduced? must you have underproduced? must he have underproduced? must we have underproduced? must you have underproduced? must they have underproduced?
V-ing perfect
must I have been underproducing? must you have been underproducing? must he have been underproducing? must we have been underproducing? must you have been underproducing? must they have been underproducing?
Interro-negative form
Simple form
must I not underproduce? must you not underproduce? must he not underproduce? must we not underproduce? must you not underproduce? must they not underproduce?
V-ing form
must I not be underproducing? must you not be underproducing? must he not be underproducing? must we not be underproducing? must you not be underproducing? must they not be underproducing?
Perfect
must I not have underproduced? must you not have underproduced? must he not have underproduced? must we not have underproduced? must you not have underproduced? must they not have underproduced?
V-ing perfect
must I not have been underproducing? must you not have been underproducing? must he not have been underproducing? must we not have been underproducing? must you not have been underproducing? must they not have been underproducing?