I must greet you must greet he must greet we must greet you must greet they must greet
V-ing form
I must be greeting you must be greeting he must be greeting we must be greeting you must be greeting they must be greeting
Perfect
I must have greeted you must have greeted he must have greeted we must have greeted you must have greeted they must have greeted
V-ing perfect
I must have been greeting you must have been greeting he must have been greeting we must have been greeting you must have been greeting they must have been greeting
Negation
Simple form
I must not greet you must not greet he must not greet we must not greet you must not greet they must not greet
V-ing form
I must not be greeting you must not be greeting he must not be greeting we must not be greeting you must not be greeting they must not be greeting
Perfect
I must not have greeted you must not have greeted he must not have greeted we must not have greeted you must not have greeted they must not have greeted
V-ing perfect
I must not have been greeting you must not have been greeting he must not have been greeting we must not have been greeting you must not have been greeting they must not have been greeting
Interrogative form
Simple form
must I greet? must you greet? must he greet? must we greet? must you greet? must they greet?
V-ing form
must I be greeting? must you be greeting? must he be greeting? must we be greeting? must you be greeting? must they be greeting?
Perfect
must I have greeted? must you have greeted? must he have greeted? must we have greeted? must you have greeted? must they have greeted?
V-ing perfect
must I have been greeting? must you have been greeting? must he have been greeting? must we have been greeting? must you have been greeting? must they have been greeting?
Interro-negative form
Simple form
must I not greet? must you not greet? must he not greet? must we not greet? must you not greet? must they not greet?
V-ing form
must I not be greeting? must you not be greeting? must he not be greeting? must we not be greeting? must you not be greeting? must they not be greeting?
Perfect
must I not have greeted? must you not have greeted? must he not have greeted? must we not have greeted? must you not have greeted? must they not have greeted?
V-ing perfect
must I not have been greeting? must you not have been greeting? must he not have been greeting? must we not have been greeting? must you not have been greeting? must they not have been greeting?