I must pair you must pair he must pair we must pair you must pair they must pair
V-ing form
I must be pairing you must be pairing he must be pairing we must be pairing you must be pairing they must be pairing
Perfect
I must have paired you must have paired he must have paired we must have paired you must have paired they must have paired
V-ing perfect
I must have been pairing you must have been pairing he must have been pairing we must have been pairing you must have been pairing they must have been pairing
Negation
Simple form
I must not pair you must not pair he must not pair we must not pair you must not pair they must not pair
V-ing form
I must not be pairing you must not be pairing he must not be pairing we must not be pairing you must not be pairing they must not be pairing
Perfect
I must not have paired you must not have paired he must not have paired we must not have paired you must not have paired they must not have paired
V-ing perfect
I must not have been pairing you must not have been pairing he must not have been pairing we must not have been pairing you must not have been pairing they must not have been pairing
Interrogative form
Simple form
must I pair? must you pair? must he pair? must we pair? must you pair? must they pair?
V-ing form
must I be pairing? must you be pairing? must he be pairing? must we be pairing? must you be pairing? must they be pairing?
Perfect
must I have paired? must you have paired? must he have paired? must we have paired? must you have paired? must they have paired?
V-ing perfect
must I have been pairing? must you have been pairing? must he have been pairing? must we have been pairing? must you have been pairing? must they have been pairing?
Interro-negative form
Simple form
must I not pair? must you not pair? must he not pair? must we not pair? must you not pair? must they not pair?
V-ing form
must I not be pairing? must you not be pairing? must he not be pairing? must we not be pairing? must you not be pairing? must they not be pairing?
Perfect
must I not have paired? must you not have paired? must he not have paired? must we not have paired? must you not have paired? must they not have paired?
V-ing perfect
must I not have been pairing? must you not have been pairing? must he not have been pairing? must we not have been pairing? must you not have been pairing? must they not have been pairing?