I must reserve you must reserve she must reserve we must reserve you must reserve they must reserve
V-ing form
I must be reserving you must be reserving she must be reserving we must be reserving you must be reserving they must be reserving
Perfect
I must have reserved you must have reserved she must have reserved we must have reserved you must have reserved they must have reserved
V-ing perfect
I must have been reserving you must have been reserving she must have been reserving we must have been reserving you must have been reserving they must have been reserving
Negation
Simple form
I must not reserve you must not reserve she must not reserve we must not reserve you must not reserve they must not reserve
V-ing form
I must not be reserving you must not be reserving she must not be reserving we must not be reserving you must not be reserving they must not be reserving
Perfect
I must not have reserved you must not have reserved she must not have reserved we must not have reserved you must not have reserved they must not have reserved
V-ing perfect
I must not have been reserving you must not have been reserving she must not have been reserving we must not have been reserving you must not have been reserving they must not have been reserving
Interrogative form
Simple form
must I reserve? must you reserve? must she reserve? must we reserve? must you reserve? must they reserve?
V-ing form
must I be reserving? must you be reserving? must she be reserving? must we be reserving? must you be reserving? must they be reserving?
Perfect
must I have reserved? must you have reserved? must she have reserved? must we have reserved? must you have reserved? must they have reserved?
V-ing perfect
must I have been reserving? must you have been reserving? must she have been reserving? must we have been reserving? must you have been reserving? must they have been reserving?
Interro-negative form
Simple form
must I not reserve? must you not reserve? must she not reserve? must we not reserve? must you not reserve? must they not reserve?
V-ing form
must I not be reserving? must you not be reserving? must she not be reserving? must we not be reserving? must you not be reserving? must they not be reserving?
Perfect
must I not have reserved? must you not have reserved? must she not have reserved? must we not have reserved? must you not have reserved? must they not have reserved?
V-ing perfect
must I not have been reserving? must you not have been reserving? must she not have been reserving? must we not have been reserving? must you not have been reserving? must they not have been reserving?